Modernize Differential SearchEngine just enough to get NUX

Summary: Ref T10032. This is sufficent to hit NUX without doing anything bad.

Test Plan:
  - Visited NUX.
  - Browsed normally.

{F1043191}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10032

Differential Revision: https://secure.phabricator.com/D14876

src/applications/differential/query/DifferentialRevisionSearchEngine.php

@@ -11,6 +11,13 @@ final class DifferentialRevisionSearchEngine
     return 'PhabricatorDifferentialApplication';
   }
 
+  public function newQuery() {
+    return id(new DifferentialRevisionQuery())
+      ->needFlags(true)
+      ->needDrafts(true)
+      ->needRelationships(true);
+  }
+
   public function getPageSize(PhabricatorSavedQuery $saved) {
     if ($saved->getQueryKey() == 'active') {
       return 0xFFFF;