SSH Keys - allow viewer to download the private key

Summary: ...cuz otherwise this is pretty pointless. Fixes T5931.

Test Plan: generated a key, downloaded the key. previously download failed.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin

Maniphest Tasks: T5931

Differential Revision: https://secure.phabricator.com/D10311

src/applications/settings/panel/PhabricatorSettingsPanelSSHKeys.php

@@ -291,7 +291,7 @@ final class PhabricatorSettingsPanelSSHKeys
         array(
           'name' => 'id_rsa_phabricator.key',
           'ttl' => time() + (60 * 10),
-          'viewPolicy' => PhabricatorPolicies::POLICY_NOONE,
+          'viewPolicy' => $viewer->getPHID(),
         ));
 
       list($type, $body, $comment) = self::parsePublicKey($public_key);