Sharing timestamp does not work on mobile

[carlobortolan]

Describe the bug
When opening a link to a lecture video with a timestamp on mobile, the video player starts at 0:00 instead of starting at the included timestamp.

To Reproduce
Open https://tum.live/w/geo/56863?t=2945 on mobile.

Expected behavior
Should start at t=2945, but starts at t=0 instead.

Additional context
Bug only occurs in production; works as it should when gocast running locally.