WPF0092 fix when generic event

currently:
```cs
EventManager.RegisterClassHandler(typeof(RadioButton), UIElement.PreviewTouchDownEvent, new EventHandler((o, e) => Toggle((RadioButton)o!, e)));
```

should be:
```cs
EventManager.RegisterClassHandler(typeof(RadioButton), UIElement.PreviewTouchDownEvent, new EventHandler<TouchEventArgs>((o, e) => Toggle((RadioButton)o!, e)));
```