Paella 8: Playbar isn't shown for live streams and their recordings if chat is active

[snoesberger]

Describe the bug
No playbar is shown when you open an Opencast live stream and the chat is active:

If I deactivate the chat, the playbar is shown.

To Reproduce
Steps to reproduce the behavior:

1. Activate chat for the Opencast series in ILIAS
2. Create a live streaming event in that series
3. Open live stream
4. See that playbar is missing

Environment (please complete the following information):

• ILIAS version: 10
• Plugin version: 10.2.1
• Opencast version 20

[dagraf]

Same is true for recordings of live-streams when the chat is activated in the object settings.