1.43: HTML5 Player Fix & AutoHide player controls in HTML5 player.

* Fix HTML5 progress bar not resizing. Thanks to [YePpHa](https://github.com/YePpHa/) for re-solving this bug in YoutubeCenter [Issue #1083](https://github.com/YePpHa/YouTubeCenter/issues/1083).
* Completely hide the Player controls on the HTML5 player since we're reloading the player anyways.