[FIX] l10n_ar: Previous verify for the partner property fpos then use auto_apply.

The problem here is before this changes, the fiscal position only take into account if them has "auto_apply" True, and for the cases that the partner has their property fiscal position configurate for a company this is not taking into account.

After this changes we evaluate for the property fiscal position for the partner and then if non result we seek a fiscal position with the auto apply and the responsability of afip.
So this the same as the original method do.

closes odoo/odoo#59875

X-original-commit: 5ddcad3cb1d6063b7be89e4f0bd35b89885f746b
Signed-off-by: Josse Colpaert <jco@openerp.com>

addons/l10n_ar/models/account_fiscal_position.py

@@ -16,6 +16,18 @@ class AccountFiscalPosition(models.Model):
         """ Take into account the partner afip responsibility in order to auto-detect the fiscal position """
         company = self.env.company
         if company.country_id == self.env.ref('base.ar'):
+            PartnerObj = self.env['res.partner']
+            partner = PartnerObj.browse(partner_id)
+
+            # if no delivery use invoicing
+            if delivery_id:
+                delivery = PartnerObj.browse(delivery_id)
+            else:
+                delivery = partner
+
+            # partner manually set fiscal position always win
+            if delivery.property_account_position_id or partner.property_account_position_id:
+                return delivery.property_account_position_id or partner.property_account_position_id
             domain = [
                 ('auto_apply', '=', True),
                 ('l10n_ar_afip_responsibility_type_ids', '=', self.env['res.partner'].browse(