[FIX] mail: mute default password warning on demo databases
[FIX] mail: mute default password warning on demo databases

The point is to warn admins of production and public-facing databases.
However it is not necessary to nag users of demo databases, even when
connecting non-locally (e.g. on runbot).

Updates #37580

(manual) forward-port of #48689

closes odoo/odoo#48691

Signed-off-by: Olivier Dony (odo) <d670d44c3ca8bd4cd53a3b09f8bf8fc35e4843cc@openerp.com>

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo