Update quality handling in SceneChannel

[SpaceOgre]

The hard coded values for quality in SceneChannel.js needs to be updated. High, medium and low is no longer used by Twitch, they use: 720p, 720p60 etc.

Atm the select start quality in code is high but since it does not exist auto will be used. I think auto should be the one to start with.

Option to choose start quality should be added to config.js

[Fansh1ne]

Start quality on 3.9.2 is auto on that quality panel (and it was before too).

[SpaceOgre]

Hmm that is weird when I look at the code it should be high 🤔

Ah it might be because the quality ids have changed, if no I'd match the given quality auto is chosen.