Fix editing permissions

Originally sparked by https://github.com/fle-internal/ka-lite-central/issues/169 on the central server repo, this fixes that issue -- so now on central, admins can access / edit data for the orgs they are a part of, and students can still safely edit their own accounts. 
![image](https://dujrsrsgsd3nh.cloudfront.net/img/emoticons/86198/niugnep-1405099756.gif)