[FIX] payment: fix payment confirmation onboarding step

User was not able to go through onboarding if they switched company.
By default it tried to edit default payment provider that was conected
to the main company, so other companies were recieving Access Error.

opw-3298326

closes odoo/odoo#121619

Signed-off-by: Antoine Vandevenne (anv) <anv@odoo.com>