Update notification.js

Fix avoid set cancelable to true when the input is false

Author: lempere

www/notification.js

@@ -54,7 +54,7 @@ module.exports = {
      * @param {Boolean} cancelable          Flag to disable dismiss alert on outside touch
      */
     confirm: function (message, resultCallback, title, buttonLabels, cancelable) {
-        if (!cancelable) { cancelable = true; }
+        if (cancelable == null) { cancelable = true; }
         var _message = (typeof message === 'string' ? message : JSON.stringify(message));
         var _title = (typeof title === 'string' ? title : 'Confirm');
         var _buttonLabels = (buttonLabels || ['OK', 'Cancel']);