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/paste/controller/PhabricatorPasteEditController.php

@@ -205,7 +205,7 @@ final class PhabricatorPasteEditController extends PhabricatorPasteController {
 
     $form->appendChild($submit);
 
-    $form_box = id(new PHUIFormBoxView())
+    $form_box = id(new PHUIObjectBoxView())
       ->setHeaderText($title)
       ->setFormError($error_view)
       ->setForm($form);