[FIX] mrp, stock: Traceability of MO disappears when product returned after delivery

Steps to reproduce:

Let's consider product P tracked by serial number
P has a manufacture BOM B with Q as componenent

- Produce P with serial number SN(with MO)
- Send P with SN to a customer A(with SO and DO)
- Force availability on P to a customer B(with SO and DO)
- Return P to stock for customer A.

Bug:

The tracability for P removed the component Q(consumed_quant_ids)
when reconciling the negative quant(generated for B) with the returned
quant from A.

opw:744424