Remove unused PropertyChanged event and OnPropertyChanged method from SettingWindowViewModel

Author: onesounds

Flow.Launcher/ViewModel/SettingWindowViewModel.cs

@@ -58,11 +58,5 @@ public string SettingWindowFont
             }
         }
     }
-
-    public event PropertyChangedEventHandler PropertyChanged;
-
-    protected virtual void OnPropertyChanged(string propertyName)
-    {
-        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
-    }
+    
 }