Fix manual update check which was hardcoded to "dev" track

[delroth]

https://dolp.in/i12848

[OatmealDome]

I tried fixing this previously in #9893, but apparently it is intentional behaviour.

[delroth]

I'm going to assume that the original decision was not made strongly. We now have the hindsight with us showing that users are confused enough by this behavior to file bug reports about it.

I think the proper fix would be something along the lines of "no update on your track, but if you switched to that other track there would be an update available". That's not completely trivial to implement, and this is a niche feature, so I think going for the less confusing "follow the selected track" option is probably better.

@spycrab any objection? You wrote this originally.

[delroth]

Merging this for now, please feel free to send a revert if you feel strongly otherwise and want to discuss it further!