Fixed #16912 -- Fixed breadcrumb styling in a couple of admin pages, broken...

Fixed #16912 -- Fixed breadcrumb styling in a couple of admin pages, broken since r16857. Thanks Florian Apolloner for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16887 bcc190cf-cafb-0310-a4f2-bffc1f526a37