remove un needed require

services/web/app/coffee/Features/Subscription/SubscriptionController.coffee

@@ -9,7 +9,6 @@ Settings   = require 'settings-sharelatex'
 logger     = require('logger-sharelatex')
 GeoIpLookup = require("../../infrastructure/GeoIpLookup")
 SubscriptionDomainHandler = require("./SubscriptionDomainHandler")
-require("../../infrastructure/Sixpack")
 
 module.exports = SubscriptionController =