slapos_subscription_request: use Software Product as resource

master/bt5/slapos_subscription_request/TestTemplateItem/portal_components/test.erp5.testSlapOSSubscriptionScenario.py

@@ -476,9 +476,10 @@ return dict(vads_url_already_registered="%s/already_registered" % (payment_trans
     self.assertEqual(len(delivery_list), 1)
     sale_packing_list = delivery_list[0]
 
+    instance_tree = subscription_request.getAggregateValue()
     subscription_delivery_line_list = self.portal.portal_catalog(
       portal_type="Sale Packing List Line",
-      default_resource_uid=self.portal.service_module.slapos_instance_subscription.getUid(),
+      resource__uid=instance_tree.InstanceTree_getSoftwareProduct().getUid(),
       grouping_reference=sale_packing_list.getReference()
     )