slapos_crm: Don't use sort_on on searchAndActivity

  The order_by was already ignored, and it is not required to sort the results, and there is no meaning of process in a sorted order. 

master/bt5/slapos_crm/SkinTemplateItem/portal_skins/slapos_crm_monitoring/Alarm_checkAndUpdatePersonalComputerAllocationScope.xml

@@ -61,7 +61,6 @@ if category_personal is not None:\n
     portal_type=\'Computer\', \n
     validation_state=\'validated\', \n
     modification_date=(DateTime() - 30).strftime(\'<=%Y/%m/%d\'), \n
-    sort_on=((\'modification_date\', "ASC"), ), \n
     default_allocation_scope_uid=category_personal.getUid(), \n
     left_join_list=[\'aggregate_related_uid\'], \n
     aggregate_related_uid=None,\n