[FIX] purchase: confirm of purchase orders with kit boms
[FIX] purchase: confirm of purchase orders with kit boms

When using phantom/kit boms,
`action_confirm` on the move can lead to the move unlink,
as new moves with the different parts of the product have
been created.

See `_action_explode` in `mrp/stock.py`

The method `action_confirm` on `stock.move` returns the list
of remaining moves.

`force_assign` should therefore be performed on this new
moves list, returned by `action_confirm`, rather than
be performed on the moves list sent to `action_confirm`

opw-660722

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