auth: fix broken deletion permission on non-superusers

auth/pipeline.py

@@ -1,8 +1,13 @@
 from social_core.pipeline.social_auth import associate_by_email
+from django.contrib.auth.models import Group
 
 
 def staff_me_up(backend, details, response, uid, user, *args, **kwargs):
     user.is_staff = True
+    try:
+        user.groups.set([Group.objects.get(name='member')])
+    except Group.DoesNotExist:
+        pass
     user.save()