Move PHUIFormBoxView to PHUIObjectBoxView

Summary: I'd like to reuse this for other content areas, renaming for now. This might be weird to keep setForm, but I can fix that later if we need.

Test Plan: reload a few forms in maniphest, projects, differential

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: Korvin, aran

Differential Revision: https://secure.phabricator.com/D7120

src/applications/repository/controller/PhabricatorRepositoryCreateController.php

@@ -101,7 +101,7 @@ final class PhabricatorRepositoryCreateController
           ->setValue('Create Repository')
           ->addCancelButton('/repository/'));
 
-    $form_box = id(new PHUIFormBoxView())
+    $form_box = id(new PHUIObjectBoxView())
       ->setHeaderText(pht('Create Repository'))
       ->setFormError($error_view)
       ->setForm($form);