Add route which went missing during rebase

apps/files_sharing/appinfo/routes.php

@@ -5,6 +5,7 @@ $this->create('core_ajax_public_preview', '/publicpreview')->action(
 		require_once __DIR__ . '/../ajax/publicpreview.php';
 	});
 
+$this->create('sharing_external_shareinfo', '/shareinfo')->actionInclude('files_sharing/ajax/shareinfo.php');
 $this->create('sharing_external_add', '/external')->actionInclude('files_sharing/ajax/external.php');
 $this->create('sharing_external_test_remote', '/testremote')->actionInclude('files_sharing/ajax/testremote.php');