Closes https://github.com/ppy/osu/issues/18468.
This doesn't stop the tutorial from downloading a second time, but at
least displays the correct status afterwards. Avoiding the download is a
bit more involved and requires a change to the flow. Probably not worth
it just yet.
To test, recommend switching to production environment, as dev server
doesn't have correct metadata for tutorial resulting in weirdness.
Placeholder pending follow-up from @nekodex (which as discussed should
probably have a second sound for the metronome locking into "stopped"
position).