fix mns_service call2

Author: Akol125

mns_subscription/tests/test_subscription.py

@@ -26,7 +26,6 @@ def test_run_subscription_success(self, mock_boto_client, mock_auth_class, mock_
         # Assert
         self.assertEqual(result, {"subscriptionId": "abc123"})
         mock_auth_class.assert_called_once()
-        mock_mns_service.assert_called_once_with(mock_auth_instance, "int")
         mock_mns_instance.subscribe_notification.assert_called_once()