Remove an outdated import inadvertently introduced in tests.

Author: carljm

tests/regressiontests/comment_tests/urls_default.py

@@ -1,4 +1,4 @@
-from django.conf.urls.defaults import *
+from django.conf.urls import patterns, include
 
 urlpatterns = patterns('',
  (r'^', include('django.contrib.comments.urls')),