Remove dust from page construction

Summary:
  ^\s+(['"])dust\1\s*=>\s*true,?\s*$\n

Test Plan: Looked through the diff.

Reviewers: chad

Reviewed By: chad

CC: aran

Differential Revision: https://secure.phabricator.com/D6769

src/applications/settings/controller/PhabricatorSettingsMainController.php

@@ -31,7 +31,6 @@ final class PhabricatorSettingsMainController
       array(
         'title' => $panel->getPanelName(),
         'device' => true,
-        'dust' => true,
       ));
   }