Fixed #11995 -- Modified the admin site definition for comments so that users...

Fixed #11995 -- Modified the admin site definition for comments so that users are shown as a raw id list. Thanks to James Bennett for the report and patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@11601 bcc190cf-cafb-0310-a4f2-bffc1f526a37