tests: Re-enable the test-anchors conformance test

This test was disabled in b5d58213. The commit message doesn't mention
this so I'm guessing it was a mistake. In any case the test appears to
work now anyway so it should be re-enabled.

http://bugzilla.clutter-project.org/show_bug.cgi?id=2363

tests/conform/test-conform-main.c

@@ -140,9 +140,7 @@ main (int argc, char **argv)
 
   TEST_CONFORM_SIMPLE ("/binding-pool", test_binding_pool);
 
-#if 0
   TEST_CONFORM_SIMPLE ("/actor", test_anchors);
-#endif
   TEST_CONFORM_SIMPLE ("/actor", test_actor_destruction);
 
   TEST_CONFORM_SIMPLE ("/model", test_list_model_populate);