[1.2.X] Fixed #14576, #14946 - FormWizard.done() method doesn't get passed the...

[1.2.X] Fixed #14576, #14946 - FormWizard.done() method doesn't get passed the last form in the list.

Thanks to cyberdelia for report and test, and steph for the initial patch.

Backport of r14574 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@15044 bcc190cf-cafb-0310-a4f2-bffc1f526a37