Generic class parameter isn't updated to patched version

This
```csharp
public class ZoomEvent : MouseEventBase {
public Vector2 Delta { get; private set; }

public static ZoomEvent GetPooled(Vector2 delta) {
var pooled = MouseEventBase.GetPooled();
pooled.Delta = delta * WheelEvent.scrollDeltaPerTick;
// ...
return pooled;
}
}
```

produces following
```csharp
public class ZoomEvent__Patched_: MouseEventBase { // I guess there should be MouseEventBase?
public Vector2 Delta { get; private set; }

public static ZoomEvent__Patched_ GetPooled(Vector2 delta) {
var pooled = MouseEventBase.GetPooled(); // And here too?
pooled.Delta = delta * WheelEvent.scrollDeltaPerTick;
// ...
return pooled;
}
}
```