[FIX] mrp: extra move line in sub-location

- Define a Component A tracked by lot.
- Define a Final Product B tracked by lot.
- Create a BOM, e.g. 5 units of A to produce B.
- Get some quantity of A in a sub-location, e.g. 'WH/Stock/Shelf 1'.
- Create a MO for 1 unit of B.
- When clicking on 'Produce', record 6 units consumed instead of 5.
- Post the inventory

5 units of A is removed from 'WH/Stock/Shelf 1' and 1 unit of A is
removed from 'WH/Stock'. The latter might create a negative quant if no
stock is available in 'WH/Stock'.

When the extra move line is created, it is created using the data of the
stock move (in `_generate_consumed_move_line`). When posting the
inventory, the quants selection is made strictly in the location set (in
`_update_available_quantity`), which might cause the mentioned negative
quant.

The solution is to select a sub-location where the product can be found.
This gives a higher chance to avoid negative quants afterwards. Note
that if we wanted to avoid negative quants, we could make a reservation
process on the move, and potentially create several stock move lines.
This is beyond the scope of the integration of MRP with sub-locations.

opw-803969

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