Fix "Access to undefined property" rule violations

lib/Router/Endpoints/ViewInBrowser.php

@@ -18,6 +18,7 @@ class ViewInBrowser {
   public $permissions = array(
     'global' => AccessControl::NO_ACCESS_RESTRICTION
   );
+  private $access_control;
 
   function __construct(AccessControl $access_control) {
     $this->access_control = $access_control;

lib/Router/Router.php

@@ -13,6 +13,8 @@ class Router {
   public $endpoint;
   public $action;
   public $data;
+  public $endpoint_action;
+  public $access_control;
   /** @var ContainerInterface */
   private $container;
   const NAME = 'mailpoet_router';