render_tag -> tag: phabricator_render_form -> phabricator_form

Summary: Convert most phabricator_render_form callsites. In the case of the "headsup view", it converts it by deleting the element entirely (this is the very old Maniphest/Differential header which we no longer use).

Test Plan: Poked around a bit.

Reviewers: vrana

Reviewed By: vrana

CC: aran

Maniphest Tasks: T2432

Differential Revision: https://secure.phabricator.com/D4726

src/applications/project/controller/PhabricatorProjectMembersEditController.php

@@ -151,13 +151,13 @@ final class PhabricatorProjectMembersEditController
 
       $list->addButton(
         $handle,
-        phabricator_render_form(
+        phabricator_form(
           $user,
           array(
             'method' => 'POST',
             'action' => $request->getRequestURI(),
           ),
-          $hidden_input.$button));
+          array($hidden_input, $button)));
     }
 
     return $list;