Use ObjectBoxView for Config pages

Summary: Doing to start to try to remove all the 'purple' PHUIHeaders around Phabricator and see what's left after.

Test Plan:
View each page

{F171007}

Reviewers: epriestley

Reviewed By: epriestley

Differential Revision: https://secure.phabricator.com/D9750

src/applications/config/controller/PhabricatorConfigGroupController.php

@@ -20,12 +20,12 @@ final class PhabricatorConfigGroupController
     }
 
     $title = pht('%s Configuration', $options->getName());
-
-    $header = id(new PHUIHeaderView())
-      ->setHeader($title);
-
     $list = $this->buildOptionList($options->getOptions());
 
+    $box = id(new PHUIObjectBoxView())
+      ->setHeaderText($title)
+      ->appendChild($list);
+
     $crumbs = $this
       ->buildApplicationCrumbs()
       ->addTextCrumb(pht('Config'), $this->getApplicationURI())
@@ -34,8 +34,7 @@ final class PhabricatorConfigGroupController
     return $this->buildApplicationPage(
       array(
         $crumbs,
-        $header,
-        $list,
+        $box,
       ),
       array(
         'title' => $title,