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/ponder/controller/PonderQuestionViewController.php

@@ -70,7 +70,6 @@ final class PonderQuestionViewController extends PonderController {
       array(
         'device' => true,
         'title' => 'Q'.$question->getID().' '.$question->getTitle(),
-        'dust' => true,
         'pageObjects' => array($question->getPHID()),
       ));
   }