fix(android): prevent changing video track when video load (#3683)

- video track must change after video loaded, if change with load state, ready state can be called

android/src/main/java/com/brentvatne/exoplayer/ReactExoplayerView.java

@@ -1818,7 +1818,7 @@ private int getGroupIndexForDefaultLocale(TrackGroupArray groups) {
     public void setSelectedVideoTrack(String type, String value) {
         videoTrackType = type;
         videoTrackValue = value;
-        setSelectedTrack(C.TRACK_TYPE_VIDEO, videoTrackType, videoTrackValue);
+        if (!loadVideoStarted) setSelectedTrack(C.TRACK_TYPE_VIDEO, videoTrackType, videoTrackValue);
     }
 
     public void setSelectedAudioTrack(String type, String value) {