examples: improve view count in cookie-sessions

closes #5414

examples/cookie-sessions/index.js

@@ -13,13 +13,10 @@ var app = module.exports = express();
 app.use(cookieSession({ secret: 'manny is cool' }));
 
 // do something with the session
-app.use(count);
-
-// custom middleware
-function count(req, res) {
+app.get('/', function (req, res) {
   req.session.count = (req.session.count || 0) + 1
   res.send('viewed ' + req.session.count + ' times\n')
-}
+})
 
 /* istanbul ignore next */
 if (!module.parent) {