Update Loader.php
The config options are read in the order plugin-standard-values -> template-standard-values -> dokuwiki.php -> local.php -> local.protected.php into DokuWiki.
But when entering the configuration manger, they options are displayed in the order dokuwiki.php -> plugin-standard-values -> template-standard-values -> local.php -> local.protected.php
This patch fixes the issue, so that the right values are displayed if there are no configs set in local.php or local.protected.php
See also https://forum.dokuwiki.org/d/18489-issues-with-modifying-confdokuwikiphp for further information.
This is a second version of this change, because on the first try, there was unnoticed php-error.