[FIX] mrp: `To Consume` qty not updated while we update in BOM

Steps to reproduce
==================
- Create and confirm MO with BOM1
- Consume the theoretical qty of your MO
- Update the BOM1
- Click on the `Produce All` button
- You will receive a message that the consumed quantity does not match the quantity
  of the BOM1 anymore
- When clicking on the set quantities and validate button, the consume
  quantities are not the ones that are previewed in the flexible consumption message,
  but the initial MO quantities.

So in this commit, we updated the `To Consume` quantities as per the flexible
consumption wizard.

task - 3323154

closes odoo/odoo#121602

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