Fixed #11055: fixed a regression in [10717] that caused uploaded files to have...

Fixed #11055: fixed a regression in [10717] that caused uploaded files to have incorrectly set file pointers. They're now, as before, reset to the beginning upon successful upload.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10739 bcc190cf-cafb-0310-a4f2-bffc1f526a37