Merge #2656

2656: Zero quota is unlimited r=mergify[bot] a=ghostwheel42

## What type of PR?

bug-fix

## What does this PR do?

Show a quota of zero as unlimkted in roundcube webmail.

### Related issue(s)

see [#2418](https://github.com/Mailu/Mailu/issues/2418#issuecomment-1418714921)


Co-authored-by: Alexander Graf <ghostwheel42@users.noreply.github.com>

webmails/roundcube/config/config.inc.php

@@ -49,6 +49,9 @@ $config['show_mailu_button'] = {{ 'true' if ADMIN and WEB_ADMIN else 'false' }};
 // set From header for DKIM signed message delivery reports
 $config['mdn_use_from'] = true;
 
+// zero quota is unlimited
+$config['quota_zero_as_unlimited'] = true;
+
 // includes
 {%- for inc in INCLUDES %}
 include('/overrides/{{ inc }}');