Fixed #9795: Since related-object selection widgets take limit_choices_to into...

Fixed #9795: Since related-object selection widgets take limit_choices_to into account, the offending code is no longer necessary and can simply be removed.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9641 bcc190cf-cafb-0310-a4f2-bffc1f526a37