Properly extends ContactUs controller

int_recaptcha/int_recaptcha/cartridge/controllers/ContactUs.js

@@ -1,7 +1,10 @@
 'use strict';
 
+var base = module.superModule;
 var server = require('server');
 
+server.extend(base);
+
 // First, let's extend the ContactUs-Landing route
 // to add recaptcha data to the template view
 server.append('Landing', function(req, res, next) {