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/config/controller/PhabricatorConfigAllController.php

@@ -93,7 +93,6 @@ final class PhabricatorConfigAllController
       array(
         'title' => $title,
         'device' => true,
-        'dust' => true,
       ));
   }