qa/tasks/mgr/test_module_selftest: fix localized value test

When mgr/selftest/testkey = foo and mgr/selftest/x/testkey is not set,
then get_localized() should return foo.

Signed-off-by: Sage Weil <sage@redhat.com>

qa/tasks/mgr/test_module_selftest.py

@@ -97,7 +97,7 @@ def get_localized_value():
             return self.mgr_cluster.mon_manager.raw_cluster_cmd(
                 "mgr", "self-test", "config", "get_localized", "testkey").strip()
 
-        self.assertEqual(get_localized_value(), "None")
+        self.assertEqual(get_localized_value(), "foo")
         self.mgr_cluster.mon_manager.raw_cluster_cmd(
             "config", "set", "mgr", "mgr/selftest/{}/testkey".format(
                 self.mgr_cluster.get_active_id()),