make sure _lastWindowState and _actualWindowState are both reset when window is shown.

native/Avalonia.Native/src/OSX/WindowImpl.mm

@@ -54,6 +54,7 @@ HRESULT WindowImpl::Show(bool activate, bool isDialog) {
 
         WindowBaseImpl::Show(activate, isDialog);
         GetWindowState(&_actualWindowState);
+        _lastWindowState = _actualWindowState;
         return SetWindowState(_lastWindowState);
     }
 }