Tournament code no longer overrides BattleRoom.win

Since tournament battle rooms already keep track of the room where the
tournament began, it's possible to have the default `BattleRoom.win` submit
the results of the battle instead of having to override the function and
still call the old code (very messy).

The initial tournament code refactor had a bug that caused problems if a 
tournament was forcefully ended, leaving the tournament battle's win check 
confused. Adding a line of code to `Tournament.forceEnd` should have fixed this.
Might want to make a note of it in the room?

I'd recommend a broadcast-red message.