Sort out application crumbs in new repository edit workflow

Summary: Ref T2231. Crumbs in the Diffusion edit workflow are a bit wonky, with stuff like "rP (master)" which isn't very useful and no link back to the main "Edit" page. Make them consistent across all the screens.

Test Plan: Loaded a bunch of these screens and saw sane crumbs on all of them.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2231

Differential Revision: https://secure.phabricator.com/D7407

src/applications/diffusion/controller/DiffusionRepositoryEditEncodingController.php

@@ -1,7 +1,7 @@
 <?php
 
 final class DiffusionRepositoryEditEncodingController
-  extends DiffusionController {
+  extends DiffusionRepositoryEditController {
 
   public function processRequest() {
     $request = $this->getRequest();
@@ -56,7 +56,7 @@ final class DiffusionRepositoryEditEncodingController
       }
     }
 
-    $crumbs = $this->buildCrumbs();
+    $crumbs = $this->buildApplicationCrumbs();
     $crumbs->addCrumb(
       id(new PhabricatorCrumbView())
         ->setName(pht('Edit Encoding')));