slapos_cloud: return todestroy status when instance tree is destroyed

master/bt5/slapos_cloud/SkinTemplateItem/portal_skins/slapos_cloud/Item_getSubscriptionStatus.py

-service = context
+item = context
 portal = context.getPortalObject()
 
+if (item.getPortalType() == 'Instance Tree') and (item.getSlapState() == "destroy_requested"):
+  return 'todestroy'
+
 # If no open order, subscription must be approved
 open_sale_order_movement_list = portal.portal_catalog(
   portal_type=['Open Sale Order Line', 'Open Sale Order Cell'],
-  aggregate__uid=service.getUid(),
+  aggregate__uid=item.getUid(),
   validation_state='validated',
   limit=1
 )
-context.log("%s %s" % (service.getRelativeUrl(), len(open_sale_order_movement_list)))
+
 if len(open_sale_order_movement_list) == 0:
   return "not_subscribed"