Remove deprecated call to renderSingleView

Summary: Return an array of renderables instead of rendering things ourselves (which we used to do with `AphrontView->renderSingleView()`.)

Test Plan: View a Releeph branch; gloriously notice no deprecated warnings.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D5363

src/applications/releeph/view/request/header/ReleephRequestHeaderListView.php

@@ -66,9 +66,7 @@ final class ReleephRequestHeaderListView
       ),
       $views);
 
-    return $this->renderSingleView(array(
-      $error_view,
-      $list));
+    return array($error_view, $list);
   }
 
   /**