Update roomtab command Document delete part in help command
Update roomtab command
Document delete part in help command

Fix check if a room already exists
The way this was written, it wouldn't allow you to set a roomtab name if it was an alias of a room, which is usually what is what happens when this command would actually be helpful...

Git-Worm/City-PS,panpawn/Gold-Server,panpawn/Pokemon-Showdown,panpawn/Gold-Server,panpawn/Gold-Server,Git-Worm/City-PS,panpawn/Pokemon-Showdown