Remove unnecessary hard-coded config information

See https://github.com/FreshRSS/FreshRSS/issues/890

app/install.php

@@ -168,10 +168,7 @@ function saveStep3() {
 			$_SESSION['bd_prefix_user'] = $_SESSION['bd_prefix'] . (empty($_SESSION['default_user']) ? '' : ($_SESSION['default_user'] . '_'));
 		}
 
-		//TODO: load `config.default.php` as default
 		$config_array = array(
-			'environment' => 'production',
-			'simplepie_syslog_enabled' => true,
 			'salt' => $_SESSION['salt'],
 			'title' => $_SESSION['title'],
 			'default_user' => $_SESSION['default_user'],