Move unset https_port after include of vars local inc

data/web/inc/prerequisites.inc.php

@@ -1,10 +1,11 @@
 <?php
 require_once $_SERVER['DOCUMENT_ROOT'] . '/inc/vars.inc.php';
 $default_autodiscover_config = $autodiscover_config;
-unset($https_port);
+
 if (file_exists($_SERVER['DOCUMENT_ROOT'] . '/inc/vars.local.inc.php')) {
   include_once $_SERVER['DOCUMENT_ROOT'] . '/inc/vars.local.inc.php';
 }
+unset($https_port);
 $autodiscover_config = array_merge($default_autodiscover_config, $autodiscover_config);
 
 header_remove("X-Powered-By");