Refs #7742 -- Removed unused `validator_list` argument (this is already being...

Refs #7742 -- Removed unused `validator_list` argument (this is already being checked by the `UserCreationForm`).


git-svn-id: http://code.djangoproject.com/svn/django/trunk@8293 bcc190cf-cafb-0310-a4f2-bffc1f526a37