[FIX] account: fpo map account is not used

Before this commit, the fiscal position is not used to determine account.

closes odoo/odoo#135289

X-original-commit: 4a447759
Signed-off-by: Cedric Snauwaert <csn@odoo.com>
Co-authored-by: Miquel Raïch <miquel.raich@forgeflow.com>