New diffusion repository rejection should not navigate away from diffusion.

Summary: Fixes T7507, Create diffusion repo rejection should not navigate away from diffusion.

Test Plan: Login as non-admin, open diffusion, attempt to create new repo, rejection dialog should appear over page instead of navigating to new page.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin, epriestley

Maniphest Tasks: T7507

Differential Revision: https://secure.phabricator.com/D12557

src/applications/diffusion/controller/DiffusionRepositoryListController.php

@@ -41,6 +41,7 @@ final class DiffusionRepositoryListController extends DiffusionController {
         ->setName(pht('New Repository'))
         ->setHref($this->getApplicationURI('new/'))
         ->setDisabled(!$can_create)
+        ->setWorkflow(!$can_create)
         ->setIcon('fa-plus-square'));
 
     return $crumbs;