[1.4.X] Fixed #18090 -- Applied filters when running prefetch_related...

[1.4.X] Fixed #18090 -- Applied filters when running prefetch_related backwards through a one-to-one relation. Backport of r17888 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.4.X@17889 bcc190cf-cafb-0310-a4f2-bffc1f526a37