change Citycom OAN Api Helper updateService() to get only single service before update

lib/Citycom/OanApiHelper.php

@@ -276,7 +276,7 @@ class Citycom_OanApiHelper {
      */
     public function updateService($service_ext_id, $data) {
         // get service and compare data
-        $services = $this->api->getServices();
+        /*$services = $this->api->getServices();
         if(!$services) {
             $this->log->error(__METHOD__.": Error getting services.");
             return false;
@@ -288,7 +288,9 @@ class Citycom_OanApiHelper {
                 $service = $cc_service;
                 break;
             }
-        }
+        }*/
+
+        $service = $this->api->getService($service_ext_id);
 
         if(!$service) {
             $this->log->error(__METHOD__.": Service not available.");