Fixed unit-test output error in m2m_and_m2o unit tests, due to a change in the...

Fixed unit-test output error in m2m_and_m2o unit tests, due to a change in the model's __repr__ earlier today

git-svn-id: http://code.djangoproject.com/svn/django/trunk@3041 bcc190cf-cafb-0310-a4f2-bffc1f526a37