Fix workboard link from project profile pages

Summary: Fixes T5165. This uses `$this->id`, but that may not always be populated anymore. Use the project ID directly instead.

Test Plan: Clicked a workboard link.

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Maniphest Tasks: T5165

Differential Revision: https://secure.phabricator.com/D9266

src/applications/project/controller/PhabricatorProjectProfileController.php

@@ -60,7 +60,7 @@ final class PhabricatorProjectProfileController
       'phabricator-project-layout',
       array($tasks, $feed));
 
-    $id = $this->id;
+    $id = $project->getID();
     $icon = id(new PHUIIconView())
           ->setIconFont('fa-columns');
     $board_btn = id(new PHUIButtonView())