[1.1.X] Fixed #9336. Changed CheckboxInput to render 'True' and 'False' input...

[1.1.X] Fixed #9336. Changed CheckboxInput to render 'True' and 'False' input strings as checked or not instead of as a value attribute. Backport of r12556 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@12557 bcc190cf-cafb-0310-a4f2-bffc1f526a37