[ticket/12775] Fix config_php::load_config_file()

PHPBB3-12775
[ticket/12775] Update phpBB/bin/phpbbcli.php

PHPBB3-12775
[ticket/12775] Update phpBB/download/file.php

PHPBB3-12775
[ticket/12775] Update phpBB/install/database_update.php

PHPBB3-12775