PiP: screen off shouln't set pip to false
In the onStop of the VideoPlayerActivity, isInPiPMode is set to off so that when reopening the player, it resumes normally.
If the PiP is running, and the screen is turned off, onStop will be called, and when turning the screen on, the player will resume with isInPipMode false, but PiP actually not running which triggers the HUD. Checking in the onStop if the screen is off stops PiP from being disabled.