macosx: Do not update views for VLCLibraryVideoViewController when active video view
This PR fixes a nasty visual bug that has the video view overlapped by the library once the video is finished playing and the next one starts. It also reenables the back button in the video playback mode to allow the video to be minimised
With fix:
Screen_Recording_2023-02-07_at_02.48.15
Before fix:
Screen_Recording_2023-02-07_at_02.50.24
Signed-off-by: Claudio Cambra developer@claudiocambra.com