Removed an unnecessary default argument in one __deepcopy__() method and fixed up the one place that was mistakenly relying on that.
Removed an unnecessary default argument in one __deepcopy__() method and fixed
up the one place that was mistakenly relying on that.

Refs #6308.


git-svn-id: 554f83ef17aa7291f84efa897c1acfc5d0035373@7167 bcc190cf-cafb-0310-a4f2-bffc1f526a37

svn2github/django,svn2github/django,svn2github/django