Improve the LessLoader check to hopefully stop the message saying cookies were blocked.

www/common/LessLoader.js

@@ -9,6 +9,7 @@ define([
     var module = { exports: {} };
     var key = Config.requireConf.urlArgs;
     var localStorage = {};
+    if (!window.cryptpadCache) {
         try {
             localStorage = window.localStorage || {};
             if (localStorage['LESS_CACHE'] !== key) {
@@ -22,6 +23,7 @@ define([
             console.error(e);
             localStorage = {};
         }
+    }
 
     var cacheGet = function (k, cb) {
         if (window.cryptpadCache) { return void window.cryptpadCache.get(k, cb); }