gtk: Use primary color for messagedialog button's text

src/_sass/gtk/_common-3.20.scss

@@ -2909,7 +2909,9 @@ messagedialog { // Message Dialog styling

                                
                                
                                
                            
                                
                                    
                                        
                                            2909  
                                            
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            2910  
                                                    &:not(:last-child) { margin-right: $container-padding; }
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            2911  
                                            
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        2912 -
                                                &.suggested-action:not(:disabled) { color: $suggested; }
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        2912 +
                                                &:not(:disabled) { color: $primary; }
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        2913 +
                                        
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        2914 +
                                                // &.suggested-action:not(:disabled) { color: $suggested; }
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            2915  
                                            
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            2916  
                                                    &.destructive-action:not(:disabled) { color: $destructive; }
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            2917  
                                                  }