Remove field selector on Diff view and Revision List View

Summary:
Ref T2222. This has some minor functionality regressions:

  - The plain diff page no longer shows unit/test status. I want to give diffs separate custom fields for this.
  - It was technically possible to shove more data on the list view, although this doensn't affect the default config.

Test Plan: Looked at list view, diff detail view. Grepped for changes.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2222

Differential Revision: https://secure.phabricator.com/D8470

src/applications/differential/controller/DifferentialRevisionViewController.php

@@ -766,7 +766,6 @@ final class DifferentialRevisionViewController extends DifferentialController {
 
     $view = id(new DifferentialRevisionListView())
       ->setRevisions($revisions)
-      ->setFields(DifferentialRevisionListView::getDefaultFields($user))
       ->setUser($user);
 
     $phids = $view->getRequiredHandlePHIDs();