[FIX] stock_landed_costs: apply correct accout on vendor bill

Steps to reproduce:
-> Install Stock+Accounting+Purchase
-> Enable landed costs on setting
-> Anglo-Saxon accounting Active
-> Create a service-type product with active landed cost.
-> Product category: ( Standard/FIFO/Average - Automated )
-> Confirm a PO with that product
-> Create a vendor bill

Bug:
default accout for the landed cost is (600000 Expenses)

Fix:
apply the correct account (set on product category) when creating
the invoice lines

opw-3129528

closes odoo/odoo#114449

Signed-off-by: William Henrotin (whe) <whe@odoo.com>