[FIX] stock_account: use fiscal position to map account
[FIX] stock_account: use fiscal position to map account

Closes #8813

bplancher/odoo,storm-computers/odoo,hip-odoo/odoo,Elico-Corp/odoo_OCB,sysadminmatmoz/OCB,microcom/odoo,sysadminmatmoz/OCB,Elico-Corp/odoo_OCB,laslabs/odoo,storm-computers/odoo,syci/OCB,bplancher/odoo,laslabs/odoo,bplancher/odoo,stephen144/odoo,ygol/odoo,optima-ict/odoo,stephen144/odoo,dfang/odoo,syci/OCB,laslabs/odoo,dfang/odoo,storm-computers/odoo,syci/OCB,storm-computers/odoo,microcom/odoo,microcom/odoo,Elico-Corp/odoo_OCB,Elico-Corp/odoo_OCB,optima-ict/odoo,bplancher/odoo,ygol/odoo,laslabs/odoo,stephen144/odoo,ygol/odoo,hip-odoo/odoo,storm-computers/odoo,hip-odoo/odoo,optima-ict/odoo,ygol/odoo,sysadminmatmoz/OCB,syci/OCB,sysadminmatmoz/OCB,microcom/odoo,hip-odoo/odoo,stephen144/odoo,bplancher/odoo,Elico-Corp/odoo_OCB,hip-odoo/odoo,ygol/odoo,stephen144/odoo,stephen144/odoo,laslabs/odoo,optima-ict/odoo,dfang/odoo,syci/OCB,optima-ict/odoo,optima-ict/odoo,ygol/odoo,sysadminmatmoz/OCB,Elico-Corp/odoo_OCB,sysadminmatmoz/OCB,microcom/odoo,microcom/odoo,syci/OCB,dfang/odoo,hip-odoo/odoo,laslabs/odoo,storm-computers/odoo,bplancher/odoo,sysadminmatmoz/OCB,ygol/odoo,dfang/odoo,dfang/odoo