Fix unregistering admin UI widgets.
Fix unregistering admin UI widgets.

Admin UI widget unregistration actually added the widgets, rather than
removing them. This updates them to call the correct functions.

KnowNo/reviewboard,KnowNo/reviewboard,beol/reviewboard,custode/reviewboard,custode/reviewboard,1tush/reviewboard,KnowNo/reviewboard,sgallagher/reviewboard,1tush/reviewboard,davidt/reviewboard,reviewboard/reviewboard,KnowNo/reviewboard,sgallagher/reviewboard,1tush/reviewboard,custode/reviewboard,bkochendorfer/reviewboard,beol/reviewboard,brennie/reviewboard,chipx86/reviewboard,1tush/reviewboard,davidt/reviewboard,bkochendorfer/reviewboard,sgallagher/reviewboard,chipx86/reviewboard,chipx86/reviewboard,1tush/reviewboard,beol/reviewboard,reviewboard/reviewboard,davidt/reviewboard,reviewboard/reviewboard,1tush/reviewboard,1tush/reviewboard,bkochendorfer/reviewboard,1tush/reviewboard,bkochendorfer/reviewboard,brennie/reviewboard,custode/reviewboard,beol/reviewboard,reviewboard/reviewboard,chipx86/reviewboard,brennie/reviewboard,1tush/reviewboard,davidt/reviewboard,sgallagher/reviewboard,brennie/reviewboard