[FIX] stock: incorrect picking state after forced availability
[FIX] stock: incorrect picking state after forced availability

Steps to reproduce:
- Enable advanced routes on the Warehouse config
- Set the route "Pick+Pack+Ship" on the YourCompany Warehouse
- Set the route "Pick+Pack+Ship" to be selectable on the SO-Line
- Create a SO with the SO-Lines containing this routes, confirm, 3
  pickings are created
- Force the availability of the Picking to the customer, transfer.

The Picking is set to draft, a backorder is created containing all
products which should have been transferred. It is not possible to
transfer this newly backorder neither, the same thing happens on the
backorder.

When rereserving while doing the transfer, it should not change the
state of the move as it would forget when availability was forced.

opw-683740

storm-computers/odoo,bplancher/odoo,Elico-Corp/odoo_OCB,bplancher/odoo,hip-odoo/odoo,bplancher/odoo,dfang/odoo,ygol/odoo,microcom/odoo,Elico-Corp/odoo_OCB,dfang/odoo,laslabs/odoo,ygol/odoo,storm-computers/odoo,dfang/odoo,storm-computers/odoo,storm-computers/odoo,laslabs/odoo,hip-odoo/odoo,bplancher/odoo,storm-computers/odoo,ygol/odoo,ygol/odoo,microcom/odoo,microcom/odoo,laslabs/odoo,hip-odoo/odoo,dfang/odoo,microcom/odoo,hip-odoo/odoo,ygol/odoo,laslabs/odoo,Elico-Corp/odoo_OCB,dfang/odoo,microcom/odoo,storm-computers/odoo,hip-odoo/odoo,Elico-Corp/odoo_OCB,hip-odoo/odoo,laslabs/odoo,laslabs/odoo,Elico-Corp/odoo_OCB,microcom/odoo,ygol/odoo,Elico-Corp/odoo_OCB,bplancher/odoo,ygol/odoo,dfang/odoo,bplancher/odoo