Use `setLiveSeekableRange` when available

[gkatsev]

A long time ago, we opened an issue that we can't properly handle live sources with MSE (https://github.com/w3c/media-source/issues/5). To fix that, setLiveSeekableRange. However, it took a while for it to be added to the spec and then browsers. We should look into implementing support for setLiveSeekableRange in VHS.

This is a followup from #817 where the PiP button doesn't show up for some streams both for us and in HLS.js. A bugzilla ticket was opened and there it was revealed that the button is hidden if the duration of the video is less than 40s. Because we don't use setLiveSeekableRange, we set the duration to be whatever we actually get in the manifest and for those with 3 segmets, it's often 30s.

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