[1.2.X] Remove the executable flag from uploadhandler.py, it wasn't. Thanks...

[1.2.X] Remove the executable flag from uploadhandler.py, it wasn't.  Thanks to Florian for the report.  Backport of [14528].

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@14529 bcc190cf-cafb-0310-a4f2-bffc1f526a37