* Correctly bind theatre mode options
Theatre mode is now bound to both "recommended videos" and "live chat"
distraction settings, rather than just "recommended videos".
The settings switch, the button, and the layout have all been updated
to reflect this.
Most likely closes: https://github.com/FreeTubeApp/FreeTube/issues/910
* Fix watch layout when no sidebar
If there's nothing to display in the sidebar according to the
distraction settings and live status, the watch page will adopt a
single column layout. If the sidebar still exists due to faulty logic,
it will be placed at the very bottom of the page.
Most likely closes: https://github.com/FreeTubeApp/FreeTube/issues/909
* Unlink default theatre mode switch
* Normalise theatre calculation, consider playlists
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