slapos_jio: allocation_scope/open/public and friend do not exist anymore

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

 portal = context.getPortalObject()
 
-category_public = portal.restrictedTraverse("portal_categories/allocation_scope/open/public", None)
-
 return portal.portal_catalog(
     portal_type='Compute Node',
     default_allocation_scope_uid=[
-      category_public.getUid(),
+      portal.restrictedTraverse("portal_categories/allocation_scope/open").getUid()
     ],
     validation_state="validated",
     sort_on=(("title", "ASC" ),)