[1.2.X] Fixed #15290 -- Fixed a CSS styling issue with borders when the link...

[1.2.X] Fixed #15290 -- Fixed a CSS styling issue with borders when the link item in a changelist isn't the first item in the list_display. Thanks to Julien Phalip for the report and patch.

Backport of r15572 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@15576 bcc190cf-cafb-0310-a4f2-bffc1f526a37