Don't disable the "Show Public Key" action for locked credentials

Summary: Fixes T5104. It's still OK to reveal public keys of locked credentials -- the controller has the right logic, this UI just isn't in sync.

Test Plan: Viewed passphrase; saw enabled menu item on locked credential.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T5104

Differential Revision: https://secure.phabricator.com/D9186

src/applications/passphrase/controller/PassphraseCredentialViewController.php

@@ -134,8 +134,7 @@ final class PassphraseCredentialViewController extends PassphraseController {
             ->setName(pht('Show Public Key'))
             ->setIcon('fa-download')
             ->setHref($this->getApplicationURI("public/{$id}/"))
-            ->setWorkflow(true)
-            ->setDisabled($is_locked));
+            ->setWorkflow(true));
       }
 
       $actions->addAction(