[1.2.X] Fixed #14279 -- Corrected a typo in the sitemaps tests (didn't affect...

[1.2.X] Fixed #14279 -- Corrected a typo in the sitemaps tests (didn't affect the passage of the test).  Thanks to jamesodo for the report and patch.  Backport of [14136].

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@14137 bcc190cf-cafb-0310-a4f2-bffc1f526a37