[FW][FIX] point_of_sale: Open cashdrawer with change

We should open the cashdrawer when paying with a non cash payment
method if change should be returned to the customer.

Use case: The customer wants to pay 10€ more with his card to get 10€
in cash in return.

closes odoo/odoo#65331

Taskid: 2449312
X-original-commit: c324c024
Signed-off-by: Quentin Lejeune (qle) <qle@odoo.com>
Signed-off-by: Antoine Prieëls <aprieels@users.noreply.github.com>