Display cursor hand on line number in revision but not in standalone view

Summary: Partially broken by D2166.

Test Plan:
Hover line number in revision.
Hover line number in standalone view.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran

Differential Revision: https://secure.phabricator.com/D2196

src/applications/differential/controller/changesetview/DifferentialChangesetViewController.php

@@ -232,8 +232,6 @@ final class DifferentialChangesetViewController extends DifferentialController {
     $detail->appendChild($output);
     $detail->setVsChangesetID($left_source);
 
-    $detail->setRevisionID($request->getInt('revision_id'));
-
     $output =
       id(new DifferentialPrimaryPaneView())
         ->setLineWidthFromChangesets(array($changeset))