VideoPlayerViewController: Fix the aspect ratio regression
This merge request brings a fix to the aspect ratio regression with:
- The delegate's optional method that is now properly declared to allow the Playback Service to call it when needed.
- The delegate's optional method allowing to adjust the video output view according to the aspect ratio selected that is now properly called after the application of the aspect ratio.
This fixes also the aspect ratio application through the action sheet selection.
Closes #1788 (closed)