Fixed #13521 -- Corrected javascript comparisons determining when to show and...

Fixed #13521 -- Corrected javascript comparisons determining when to show and hide the 'add another' inline button. Thanks to darkrho for the report and patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@13234 bcc190cf-cafb-0310-a4f2-bffc1f526a37