fix warnings for optional parameters under PHP 8.0

[dinoex]

Running racktables under PHP 8.0 seems fine.

I collected some warnings:

# sort -u /logs/php-error.log
PHP Deprecated:  Required parameter $before follows optional parameter $instance in /usr/local/www/racktables/wwwroot/inc/database.php on line 5568
PHP Deprecated:  Required parameter $before follows optional parameter $instance in /usr/local/www/racktables/wwwroot/inc/database.php on line 5641
PHP Deprecated:  Required parameter $changes follows optional parameter $instance in /usr/local/www/racktables/wwwroot/inc/database.php on line 5641
PHP Deprecated:  Required parameter $contents follows optional parameter $file_id in /usr/local/www/racktables/wwwroot/inc/database.php on line 4856
PHP Deprecated:  Required parameter $object_id follows optional parameter $instance in /usr/local/www/racktables/wwwroot/inc/database.php on line 5568
PHP Deprecated:  Required parameter $object_id follows optional parameter $instance in /usr/local/www/racktables/wwwroot/inc/database.php on line 5641
PHP Deprecated:  Required parameter $port follows optional parameter $instance in /usr/local/www/racktables/wwwroot/inc/database.php on line 5568
PHP Deprecated:  Required parameter $port_name follows optional parameter $instance in /usr/local/www/racktables/wwwroot/inc/database.php on line 5568

The optional for seems not in use, Plugins not tested.

grep -r of the function names finds only complete function calls.

The included patch fixes the issue for me.

[infrastation]

Thank you.