Use jetpack autoloader and composer instead of namespace rewrite

inc/database/engine/class-query.php

@@ -17,7 +17,7 @@ defined('ABSPATH') || exit;
  *
  * @since 1.0.0
  */
-class Query extends \WP_Ultimo\Dependencies\BerlinDB\Database\Query {
+class Query extends \BerlinDB\Database\Query {
 
  	/**
 	 * The prefix for the custom table.