Video playback bar doesn't hide automatically in some circumstances

[snoesberger]

Describe the bug
Video playback bar doesn't hide automatically in some circumstances.

To Reproduce
Steps to reproduce the behavior:

1. Open a video from an Opencast series
2. Clicking inside the player (not the controls) to pause/play the video
3. Opening sub menus like playback speed, captions and settings
4. Playback bar doesn't hide anymore

Clicking inside the control elements will make them disappear again, but this ideally that shouldn't be necessary.

Expected behavior
When the mouse pointer is removed from the playback bar, the playback bar should disappear after a configured time.

Environment (please complete the following information):

• ILIAS version: 8
• Plugin version: 8
• Opencast version 16

Additional context
This bug has been fixed in the latest version of paella-core (1.50.2 polimediaupv/paella-core@f3daf73), so it is only necessary to update paella-core to this version.