Rename PhabricatorSettingsPanel subclasses for consistency

Summary: Ref T5655.

Test Plan: `arc lint` and `arc unit`

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T5655

Differential Revision: https://secure.phabricator.com/D11136

src/applications/auth/controller/PhabricatorAuthNeedsMultiFactorController.php

@@ -13,7 +13,7 @@ final class PhabricatorAuthNeedsMultiFactorController
     $request = $this->getRequest();
     $viewer = $request->getUser();
 
-    $panel = id(new PhabricatorSettingsPanelMultiFactor())
+    $panel = id(new PhabricatorMultiFactorSettingsPanel())
       ->setUser($viewer)
       ->setViewer($viewer)
       ->setOverrideURI($this->getApplicationURI('/multifactor/'))