Give "delete Repository" a disabled style

Summary: Some discussion on IRC. This is more consistent with other disabled items, which are click-to-explain.

Test Plan: Viewed UI, clicked link.

Reviewers: btrahan, dctrwatson, asherkin

Reviewed By: asherkin

CC: aran

Differential Revision: https://secure.phabricator.com/D7857

src/applications/diffusion/controller/DiffusionRepositoryEditMainController.php

@@ -231,6 +231,7 @@ final class DiffusionRepositoryEditMainController
         ->setIcon('delete')
         ->setHref(
           $this->getRepositoryControllerURI($repository, 'edit/delete/'))
+        ->setDisabled(true)
         ->setWorkflow(true));
 
     return $view;