Fix php error in config page
Fix php error in config page

Don't pass a string as default value for an array to fix the following error:

'Argument 2 passed to gpc_get_string_array() must be of the type array, string given, called in root\to\base\plugins\Snippets\pages\config.php on line 19 and defined' in 'root\to\base\core\gpc_api.php' line 246

mantisbt-plugins/snippets,mantisbt-plugins/snippets