Revert r36916 for now ("(bug 14698) Make "Block account creation" work as advertised...

Revert r36916 for now ("(bug 14698) Make "Block account creation" work as advertised.  :) ")
This doesn't appear to be working the right way; it's finding that permission is not allowed, but then trying to ignore particular reasons why it might not be allowed.
Correct fix should be to ensure that the correct result is actually obtained from the permission check in the first place!
Note that the error key may have 'autoblocktext' for autoblocks, which would not match this check as written.