Fix errors found by PHPStan

Test Plan: Ran `phpstan analyze -a autoload.php phabricator/src`.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin, hach-que

Differential Revision: https://secure.phabricator.com/D17371

src/applications/config/controller/PhabricatorConfigClusterDatabasesController.php

@@ -21,7 +21,7 @@ final class PhabricatorConfigClusterDatabasesController
           ->setText(pht('Documentation')));
 
     $crumbs = $this
-      ->buildApplicationCrumbs($nav)
+      ->buildApplicationCrumbs()
       ->addTextCrumb($title)
       ->setBorder(true);