change order of registering api and capabilities to fix file version previews

apps/files_versions/appinfo/routes.php

@@ -5,11 +5,11 @@
  * See the COPYING-README file.
  */
 
-// Register with the capabilities API
-OC_API::register('get', '/cloud/capabilities', array('OCA\Files_Versions\Capabilities', 'getCapabilities'), 'files_versions', OC_API::USER_AUTH);
-
 /** @var $this \OCP\Route\IRouter */
 $this->create('core_ajax_versions_preview', '/preview')->action(
 function() {
 	require_once __DIR__ . '/../ajax/preview.php';
 });
+
+// Register with the capabilities API
+OC_API::register('get', '/cloud/capabilities', array('OCA\Files_Versions\Capabilities', 'getCapabilities'), 'files_versions', OC_API::USER_AUTH);