Make Project Mobile menu more resilient

Summary: This sets $project at the controller level so it's available to building the icon nav and mobile menu, instead of guessing the $id. Fixes T7289

Test Plan: Test a project and its mobile menu when it does and does not have a workboard initialized. Also tested coming in via a slug and an id.

Reviewers: epriestley, btrahan

Reviewed By: btrahan

Subscribers: Korvin, epriestley

Maniphest Tasks: T7289

Differential Revision: https://secure.phabricator.com/D11848

src/applications/project/controller/PhabricatorProjectBoardController.php

@@ -3,16 +3,6 @@
 abstract class PhabricatorProjectBoardController
   extends PhabricatorProjectController {
 
-  private $project;
-
-  protected function setProject(PhabricatorProject $project) {
-    $this->project = $project;
-    return $this;
-  }
-  protected function getProject() {
-    return $this->project;
-  }
-
   public function buildIconNavView(PhabricatorProject $project) {
     $id = $project->getID();
     $nav = parent::buildIconNavView($project);