fix: update the screen share track

Author: ye231101

src/components/RoomScreen.js

@@ -53,7 +53,7 @@ function ParticipantTile({ participant }) {
 
   const cameraTrack = tracks.find((t) => t.source === Track.Source.Camera && t.publication?.track);
   const screenShareTrack = tracks.find((t) => t.source === Track.Source.ScreenShare && t.publication?.track);
-  const videoTrack = cameraTrack || screenShareTrack;
+  const videoTrack = screenShareTrack || cameraTrack;
   const publication = videoTrack?.publication;
 
   useEffect(() => {