Client: Dropbox player (and potentially others) - unsynched message behaviour.

[Scroody]

Describe the bug

When sharing an external video and pastinga dropbox video url, the unsynched message shows up after 5 seconds of paused video.

To Reproduce
Steps to reproduce the behavior:

1. Go to Share external video
2. Let it play for a period of time
3. Pause it
4. See error - after 5 seconds

Expected behavior
The player not to show de message, for it is not unsynched (impossible to be unsynched with only 1 player)

Actual behavior
Shows unsynched message ..

Screenshots

BBB version:
BBB30