empty the 'note' field when setting a custom quota on the admin panel

www/admin/inner.js

@@ -517,11 +517,11 @@ define([
             note,
             h('nav', [set, remove])
         ]);
+        var $note = $(note);
 
         var getValues = function () {
             var key = $key.val();
             var _limit = parseInt($(limit).val());
-            var _note = $(note).val();
             if (key.length !== 44) {
                 try {
                     var u = Keys.parseUser(key);
@@ -535,6 +535,7 @@ define([
             if (isNaN(_limit) || _limit < 0) {
                 return void UI.warn(Messages.admin_invalLimit);
             }
+            var _note = ($note.val() || "").trim();
             return {
                 key: key,
                 data: {
@@ -585,6 +586,7 @@ define([
                 }
                 APP.refreshLimits();
                 $key.val('');
+                $note.val('');
             });
         });