Remove unnecessary $nav

Summary: See D4451.

Test Plan: Looked at Maniphest, saw it unchanged.

Reviewers: edward, btrahan

Reviewed By: edward

CC: aran

Differential Revision: https://secure.phabricator.com/D4484

src/applications/maniphest/controller/ManiphestTaskListController.php

@@ -393,7 +393,7 @@ final class ManiphestTaskListController extends ManiphestController {
 
     $title = pht('Task List');
 
-    $crumbs = $this->buildApplicationCrumbs($nav)
+    $crumbs = $this->buildApplicationCrumbs()
       ->addCrumb(
         id(new PhabricatorCrumbView())
           ->setName($title))