- don't check for isAudioOnly == !videoEnabled, as this prevents enabling again
video and text tracks renderers in some cases;
- when reloading play queue manager if that's needed, disable or enable video
and text tracks renderers, as they may need to be enabled again in some cases
like starting a video in main player, opening play queue, switching to
background player on it and switching back to main player;
- disable or enable video renderers also for streams with AUDIO_STREAM
StreamType, as doing so doesn't raise any issue and simplifies code;
- reword and move some comments to make them easier to understand.
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