Fix an issue where redirects would work incorrectly in Quicksand

Summary: Ref T7061. Quicksand still needs an ajax-style response here.

Test Plan: Clicked a file detail page (this redirects) with column open, ended up in the right place.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T7061

Differential Revision: https://secure.phabricator.com/D12206

src/applications/base/controller/PhabricatorController.php

@@ -414,7 +414,7 @@ abstract class PhabricatorController extends AphrontController {
           ));
       }
     } else if ($response instanceof AphrontRedirectResponse) {
-      if ($request->isAjax()) {
+      if ($request->isAjax() || $request->isQuicksand()) {
         return id(new AphrontAjaxResponse())
           ->setContent(
             array(