[FIX] stock_landed_costs: update `price_unit`

The value and remaining value fields were correctly adapted when a
landed cost was applied on a move, but not the unit price one. This is
problematic, as the product should indeed cost more.

To properly compute this value, we change the meaning of
`stock_landed_cost_value` which is now the total value of the landed
cost, not the prorated value of what is still in stock.

Also fix the computation of the quantity already delivered in case of
negative stock.

Fixes #19254

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