Clear Fund initiative notifications when viewing an initaitive

Summary: Fixes T6301. Just missed this in building out the page.

Test Plan: Viewed an initiative, verified `pageObjects` populated correctly.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T6301

Differential Revision: https://secure.phabricator.com/D10700

src/applications/fund/controller/FundInitiativeViewController.php

@@ -78,6 +78,7 @@ final class FundInitiativeViewController
       ),
       array(
         'title' => $title,
+        'pageObjects' => array($initiative->getPHID()),
       ));
   }