Turn off spellcheck, etc, on main search input

Summary: Ref T12872, turns off all these "helpful" fields.

Test Plan: Type "phab" in main search and do not get a suggestion for "phablet".

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T12872

Differential Revision: https://secure.phabricator.com/D18163

src/view/page/menu/PhabricatorMainMenuSearchView.php

@@ -39,6 +39,9 @@ final class PhabricatorMainMenuSearchView extends AphrontView {
         'name' => 'query',
         'id' => $search_id,
         'autocomplete' => 'off',
+        'autocorrect' => 'off',
+        'autocapitalize' => 'off',
+        'spellcheck' => 'false',
       ));
 
     $target = javelin_tag(