Fix two minor breadcrumb issues in Config

Summary:
Fixes T13159. Two issues here:

  - When viewing a particular config setting, there's an extra "Config" crumb.
  - On the page for a config group, the link to the parent group has an extra "/config/" in it.

Test Plan:
  - Viewed a page for a particular setting, no longer saw an extra "Config" crumb.
  - Viewed a page for a setting group, clicked parent crumb, got taken to a real page.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13159

Differential Revision: https://secure.phabricator.com/D19501

src/applications/config/controller/PhabricatorConfigEditController.php

@@ -231,7 +231,6 @@ final class PhabricatorConfigEditController
     $box_header[] = $key;
 
     $crumbs = $this->buildApplicationCrumbs();
-    $crumbs->addTextCrumb(pht('Config'), $this->getApplicationURI());
     if ($group) {
       $crumbs->addTextCrumb($group->getName(), $group_uri);
     }

src/applications/config/controller/PhabricatorConfigGroupController.php

@@ -30,7 +30,7 @@ final class PhabricatorConfigGroupController
     $view = $this->buildConfigBoxView($box_header, $list);
 
     $crumbs = $this->buildApplicationCrumbs()
-      ->addTextCrumb($group_name, $this->getApplicationURI($group_uri))
+      ->addTextCrumb($group_name, $group_uri)
       ->addTextCrumb($options->getName())
       ->setBorder(true);