Updated `TimeInput` changes from [8491] to allow time widgets to be used with...

Updated `TimeInput` changes from [8491] to allow time widgets to be used with unicode values. Fixes #7499.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@8549 bcc190cf-cafb-0310-a4f2-bffc1f526a37