I recently upgraded one of my testing user accounts to give it superadmin priveleges. I did it to test for a bug, but now I can't undo it. The checkbox on the user profile doesn't appear. (I read in the trac somewhere that the devs removed it). I looked into the database usermeta tables hoping I could figure it out how to change it in there but can't see anything obvious.
So, before I break something important, how do I downgrade a superadmin back to a regular user account?