removed uneeded releaselock on goBack

javascript/src/QfqForm.js

@@ -1364,9 +1364,6 @@ var QfqNS = QfqNS || {};
      */
     n.QfqForm.prototype.goBack = function () {
         var alert;
-        if(this.lockAcquired) {
-            this.releaseLock();
-        }
 
         if (window.history.length < 2) {
             alert = new n.Alert(