Fix youtube connector
Fix youtube connector

Get unique ID of current video in miniplayer playlist.
Remove workaround for fullscreen mode.
Remove unused unique ID source.

Closes #2121.

alexesprit/web-scrobbler,carpet-berlin/web-scrobbler,galeksandrp/web-scrobbler,fakelbst/Chrome-Last.fm-Scrobbler,fakelbst/Chrome-Last.fm-Scrobbler,alexesprit/web-scrobbler,inverse/web-scrobbler,carpet-berlin/web-scrobbler,david-sabata/web-scrobbler,inverse/web-scrobbler,david-sabata/web-scrobbler,galeksandrp/web-scrobbler