1.28.0 BeatUpServer lobbies don't alias to 1.22.0+

[rcelyte]

BeatUpServer lobbies are cross compatible between 1.28.0 and older versions since this commit, which both public instances are now updated to.

[roydejong]

I'm expecting BeatTogether to make a decision today, or at least before the end of the week, as to how they're handling 1.28. There's a chance they're doing a hard compatibility break, so some custom logic per server type may be needed.

I'll wait for that decision and then figure out the best way to handle this on BSSB.

[roydejong]

Just to follow up: BeatTogether is making a clean break on 1.28 with no backwards compatibility, following official servers. MultiplayerCore needs to be updated as well for unrelated reasons (SongCore compatibility).

I'll have to figure out per-server-type logic for aliasing.