fix proxyauth icon

src/server.js

@@ -5,7 +5,7 @@ exports = module.exports = {
     stop
 };
 
-let assert = require('assert'),
+const assert = require('assert'),
     async = require('async'),
     blobs = require('./blobs.js'),
     cloudron = require('./cloudron.js'),
@@ -19,7 +19,6 @@ let assert = require('assert'),
     routes = require('./routes/index.js'),
     settings = require('./settings.js'),
     users = require('./users.js'),
-    util = require('util'),
     ws = require('ws');
 
 let gHttpServer = null;