Fixed #13674 -- Ensure that labels on added inlines fields have the right...

Fixed #13674 -- Ensure that labels on added inlines fields have the right 'for' attribute. Thanks to Jonas for the report, and Julien Phalip for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15436 bcc190cf-cafb-0310-a4f2-bffc1f526a37