Allow Owner Packages to be in a Dashboard Panel

Summary: Ref T12324. Add back Owners.

Test Plan: read carefully

Reviewers: epriestley, eadler

Reviewed By: eadler

Subscribers: Korvin

Maniphest Tasks: T12324

Differential Revision: https://secure.phabricator.com/D17588

src/applications/owners/query/PhabricatorOwnersPackageSearchEngine.php

@@ -15,10 +15,6 @@ final class PhabricatorOwnersPackageSearchEngine
     return new PhabricatorOwnersPackageQuery();
   }
 
-  public function canUseInPanelContext() {
-    return false;
-  }
-
   protected function buildCustomSearchFields() {
     return array(
       id(new PhabricatorSearchDatasourceField())