Fixed #10573 -- Corrected autofocus problem in admin when the first widget...

Fixed #10573 -- Corrected autofocus problem in admin when the first widget displayed is a multiwidget. Thanks to rduffield for the report, and to Ramiro and Julien Phalip for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15452 bcc190cf-cafb-0310-a4f2-bffc1f526a37