bug: MariaDB detection uses loose stripos comparison in upgrade advisor

[somethingwithproof]

Description

The upgrade advisor uses a loose comparison when detecting MariaDB:

if (stripos($database['Value'], 'mariadb') == false) {
    unset($fields_syslog_update['engine']['array']['aria']);
} else {
    $fields_syslog_update['engine']['value'] = 'aria';
}

Location:

• setup.php (around line 966)

Why this is a bug

stripos() returns either an integer position or false.
Using == false is ambiguous and can mis-handle index 0 as not found.

Expected

Use strict comparison:

if (stripos($database['Value'], 'mariadb') === false) {
    ...
}

This keeps behavior consistent and avoids subtle detection errors.