fix(FEC-13713): playlist is not updating the active item visually

[lianbenjamin]

• bugfix

the issue:
when loading a playlist where the player is in autoplay=false and switching between the items, the current active item is not being updated visually (marked with the blue line on the side).

root cause:
setActiveItem happens after MEDIA_LOADED event.
MEDIA_LOADED event is fired only after clicking play; so if choosing an item from the playlist panel and the player is still not starting to play, the active item indication (blue mark) is not being updated.

solution:
listen to CHANGE_SOURCE_ENDED event instead of MEDIA_LOADED.

Solves FEC-13713