Fixed #8917 -- Comments are now displayed in reverse order by submit_date in...

Fixed #8917 -- Comments are now displayed in reverse order by submit_date in the admin. Thanks to arien for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9038 bcc190cf-cafb-0310-a4f2-bffc1f526a37