CAS redirect bug found

[mtheoryx]

When submitting option changes from the wpbackend, /wp-admin/options.php (target of that form) is appended when site is in lockdown. Takes you to the FULL options.php page, instead of the page you submitted the changes from.

Bug is spotted, and an unsuccessful hotfix attempted in the lockdown branch if anyone wants to give it a try. Otherwise, I'll attempt an official fix next week and push it out to Master once it works on a few installs.