Added a test that 'firstof' template filter doesn't auto-escape. cycle tag...

Added a test that 'firstof' template filter doesn't auto-escape. cycle tag already has such a test (cycle20). Refs #10912

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17176 bcc190cf-cafb-0310-a4f2-bffc1f526a37