How do I change the Roundcube Special Junk Folder to Junk across all accounts?

[Digital Essence]

Hi,

I've like to change the Roundcube Junk Special Folder to be Junk rather than Spam across all current and future emails accounts on the server.

I read to add $config['junk_mbox'] = 'Junk';

/var/www/html/roundcube/config/defaults.inc.php already has $config['junk_mbox'] = 'Junk';

and I've edited:

/var/www/html/roundcube/config/config.inc.php and also added the line:

$config['junk_mbox'] = 'Junk';

But this hasn't made any difference.

I've read that Roundcube saves per-user folder preferences in its MySQL database when a user first logs in or changes settings. These stored preferences take precedence over config.inc.php for existing accounts and I've got these instructions to resolve this.
Before I break anything. Is this the right course of action?