[FIX] mrp: wrong BoM from orderpoint in 3 steps

Steps to reproduce the bug:
- Go to the warehouse settings:
    - enable “3 steps for manufacturing”
- Create a storable product “P1” with 2 BoM
- Create an orderpoint:
    - Preferred route: Manufacturing
    - Product: “P1”
    - BoM: select the second BoM
    - To order: 1

- Click on the “Order once” button

Problem:
The manufacturing order is created with the first BoM instead of the
second.

As we are in 3 steps, the “run_pull” function is triggered first, with
values prepared from the orderpoint so the bom is well set:
https://github.com/odoo/odoo/blob/16.0/addons/stock/models/stock_orderpoint.py#L515-L523

Then the “run_manufacture” function is triggered but with vals prepared
from the move, not from the orderpoint, so we lose the BoM information
that the user has selected:
https://github.com/odoo/odoo/blob/16.0/addons/stock/models/stock_move.py#L1334-L1340



opw-3217945

closes odoo/odoo#116685

Signed-off-by: Tiffany Chang <tic@odoo.com>