add usageupdate

zimbraSingle.php

@@ -845,7 +845,7 @@ function zimbraSingle_ChangePackage($params)
  */
 function zimbraSingle_ConfigOptions($params)
 {
-    if(isset($_POST['packageconfigoption'])) {
+    if(isset($_POST['save'])) {
         if(zimbraSingleCreateCustomFields($_POST['packageconfigoption']) == false) {
             return false;
         };