Fixed stray comment introduced by d3b71b9.

Thanks Claude Paroz for the report.

tests/prefetch_related/tests.py

@@ -1068,7 +1068,6 @@ class Ticket21760Tests(TestCase):
             for _ in range(3):
                 self.rooms.append(Room.objects.create(house = house))
 
-    #@override_settings(DEBUG=True)
     def test_bug(self):
         prefetcher = get_prefetcher(self.rooms[0], 'house')[0]
         queryset = prefetcher.get_prefetch_queryset(list(Room.objects.all()))[0]