fix(验证码中间件)： zk默认开关为关

@@ -30,9 +30,9 @@ let captchaReq = new models.DescribeCaptchaResultRequest();
  */
 module.exports = function(req, res, next) {
 
-  const isClosedCaptcha = _.get(req.app.locals.wap, 'ufo.coupon', false);
+  const isOpenCaptcha = _.get(req.app.locals.wap, 'ufo.coupon', false);
 
-  if (isClosedCaptcha) {
+  if (!isOpenCaptcha) {
     return next();
   }