Show/Hide UI Hotkey fix on Avalonia (#5133)

* fix show/hide ui for ava

* revert style

* unbound by default

* revert

src/Ryujinx.Ava/AppHost.cs

@@ -1044,7 +1044,7 @@ namespace Ryujinx.Ava
                             ScreenshotRequested = true;
                             break;
                         case KeyboardHotkeyState.ShowUi:
-                            _viewModel.ShowMenuAndStatusBar = true;
+                            _viewModel.ShowMenuAndStatusBar = !_viewModel.ShowMenuAndStatusBar;
                             break;
                         case KeyboardHotkeyState.Pause:
                             if (_viewModel.IsPaused)