Makes progressbar being able to hover from the very beginning (also works when paused).
当前为
1. Make Youtube's progress bar being able to hover from the very beginning.
(In original behavior it will show the bar for 3~5 sec and then hide and being able to hover)
2. Make Youtube's progress bar being able to hover when the video is paused.
(In original behavior it will always show the bar when the video is paused)
