slapos_jio: Be consistent with the listbox

master/bt5/slapos_jio/SkinTemplateItem/portal_skins/slapos_hal_json_style/Project_hasItem.py

-# This script might not be efficient to a large quantities of
-# Compute Nodes
-from DateTime import DateTime
 import json
-kw = {"project_uid": context.getUid(),
-      "at_date": DateTime(),
-      "limit": 1}
-
-return json.dumps(len(context.portal_simulation.getCurrentTrackingList(**kw)))
+return json.dumps(len(context.Project_getComputeNodeTrackingList()))