Fix mismatched parentheses and missing comma in south migration.

Was having some trouble getting the latest django-allauth migrations to run on a Django 1.5 project using south, turns out there's some mismatched parentheses. 

It took an embarrassingly long time for me to notice this. Let's pretend I was totally pro and saw it immediately instead of playing in pdb for close to an hour trying to figure out what was wrong. :D