Proposing Core changes to YTPlaybackFix

[AppropriateNet2928]

I have modified the Tweak.xm to have:

1. Modified some variables and modified the hook of YTPlayerViewController for better seekToTime method; The hook was modified like this:

• The currentVideoMediaTime part received an complete write up to keep two time variables synchronized, gTime is currentVideoMediaTime, meaning the time that the video is at and gSavedTime is gTime. Therefore, gSavedTime is the exact time that the video received the error, and then to return currentVideoMediaTime;

• The seekToTime part received a small modification, it just made gSavedTime equal to gTime so we can later use seekToTime like this: seekToTime:gSavedTime, meaning that u seek to the time that the video received the error.

2. An simpler anti-loop logic:

The old anti-loop logic was kinda sus and screamed that it may break at any time, so therefore I removed it and added an simpler anti-loop logic instead, with a simple BOOL variable that has the role to stop the retry logic when it is not needed and to start it when it is needed.

This logic is simpler and has the highest chances of a pozitive result :))

3. Some small modification throughout the code to use the new variables instead of the old ones;

The gBurstCount variable was removed due to it being part of the old anti-loop logic :))