GlobalAuth: Handle multiple usergroups.csv entries
GlobalAuth: Handle multiple usergroups.csv entries

I don't know why users get two sometimes (I think it's an old bug that got fixed?) but this handles it better.

Zarel/Pokemon-Showdown,xfix/Pokemon-Showdown,svivian/Pokemon-Showdown,xfix/Pokemon-Showdown,xfix/Pokemon-Showdown,xfix/Pokemon-Showdown,Zarel/Pokemon-Showdown,svivian/Pokemon-Showdown,xfix/Pokemon-Showdown,Zarel/Pokemon-Showdown,svivian/Pokemon-Showdown,svivian/Pokemon-Showdown,svivian/Pokemon-Showdown