Remove magic constant __DIR__ from data.php (#1150)

Removes magic constant __DIR__ from data.php as it is not needed and it breaks the development setup.

Author: VerifiedJoseph

frontend/data.php

@@ -6,7 +6,7 @@
 use IntruderAlert\Exception\ConfigException;
 use IntruderAlert\Helper\Json;
 
-require(__DIR__ . '/backend/vendor/autoload.php');
+require('backend/vendor/autoload.php');
 
 $data = '';