AdminHandler::form_user_success should call $form->save()

[drzax]

Even though all the default form fields are handled by the AdminHandler::form_user_success function I think it should still call $form->save() somewhere.

By not calling $form->save() it forces plugin authors who add fields to the form to manually save them even if a storage mechanism (such as "user:myplugin") has been specified in the control.

The only downside I see to simply adding a call to $form->save() is that it won't generate a notice - so a little more work is required.