Steps to reproduce:
- Create a PO (fifo automated product)
- Recieve product
- Create the bill and add the landed cost product to it
- Create the landed cost before posting the bill
- Post the bill

Bug:
when creating the landed costs if the bill is already posted
the created amls are reconciled otherwise they aren't

Fix:
reconcile the landed costs amls after posting the bill

opw-3377088

closes odoo/odoo#131395

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