Add "device ready" flag to standalone dialog pages

Summary: Fixes T5541. Standalone dialog pages, including the high-security auth page, should all work fine on mobile.

Test Plan: {F173598}

Reviewers: chad, joshuaspence

Reviewed By: joshuaspence

Subscribers: epriestley

Maniphest Tasks: T5541

Differential Revision: https://secure.phabricator.com/D9799

src/applications/base/controller/PhabricatorController.php

@@ -350,6 +350,7 @@ abstract class PhabricatorController extends AphrontController {
         $view = id(new PhabricatorStandardPageView())
           ->setRequest($request)
           ->setController($this)
+          ->setDeviceReady(true)
           ->setTitle($title)
           ->appendChild($page_content);