Fixed #14454 -- converted admin_widgets tests from doctests to unittests. We...

Fixed #14454 -- converted admin_widgets tests from doctests to unittests.  We have always been at war with doctests.  Thanks to prestontimmons for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@14221 bcc190cf-cafb-0310-a4f2-bffc1f526a37