Fix permission check for "Create Task" on workboards

Summary: Fixes T9090. You don't need to be able to edit a project to create tasks on its workboard. Being able to view the project is sufficient, and the user certianly can if they got this far.

Test Plan: Viewed workboard, hit "Create Task".

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9090

Differential Revision: https://secure.phabricator.com/D14015

src/applications/project/controller/PhabricatorProjectBoardViewController.php

@@ -624,8 +624,7 @@ final class PhabricatorProjectBoardViewController
       ->setMetadata(
         array(
           'columnPHID' => $column->getPHID(),
-        ))
-      ->setDisabled(!$can_edit);
+        ));
 
     $batch_edit_uri = $request->getRequestURI();
     $batch_edit_uri->setQueryParam('batch', $column->getID());