Always suspend drawing session before disposing

Oops, forgor to include it before disposing it.
https://microsoft.github.io/Win2D/WinUI3/html/M_Microsoft_Graphics_Canvas_UI_Xaml_CanvasVirtualImageSource_CreateDrawingSession.htm#:~:text=Type%3A%C2%A0CanvasDrawingSession-,Remarks,-The%20specified%20region

Author: neon-nyan

CollapseLauncher/Classes/Helper/Background/Loaders/MediaPlayerLoader.cs

@@ -327,13 +327,19 @@ private static async Task<StorageFile> GetFileAsStorageFile(string filePath)
 
         private void FrameGrabberEvent(MediaPlayer mediaPlayer, object args)
         {
+            if (_isCanvasCurrentlyDrawing == 1)
+            {
+                return;
+            }
+
             CanvasDrawingSession? drawingSession = null;
             try
             {
                 Interlocked.Exchange(ref _isCanvasCurrentlyDrawing, 1);
                 mediaPlayer.CopyFrameToVideoSurface(_currentCanvasBitmap);
                 drawingSession = _currentCanvasVirtualImageSource?.CreateDrawingSession(_currentDefaultColor, _currentCanvasDrawArea);
                 drawingSession?.DrawImage(_currentCanvasBitmap);
+                _currentCanvasVirtualImageSource?.SuspendDrawingSession(drawingSession);
             }
             catch
         #if DEBUG