[FIX] stock: put in pack and unreserve

- Create a product P, tracked by lot
- Add some stock with a lot
- Create an outgoing picking
- Set 10 units of P
- Set 2 done, Put in Pack
- Unreserve

An error occurs: 'It is not possible to unreserve more products of P
than you have in stock.'

It happens because the `lot_id` is removed from the copied
`stock.move.line`.

Commit eac8c06e makes sense for incoming pickings, but
not for internal or outgoing transfers.

opw-2288208

closes odoo/odoo#54355

X-original-commit: ed738fb56ffe84f3af08b84e429db916a5e560b6
Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>