[FIX] stock: extra move incorrect qty

Usecase to reproduce:
- Create a product A with a qty on hand 5.5
- Create a delivery order with an initial demand of 5.5
- Validate it with a qty equals to 5.95
The initial demand is updated to 5.951 then reduced to 5.95
and a backorder is created with an initial demand of 0.001.
That should not happen since I process extra quantities.

It python 5.95 - 5.5 = 0.4500000000000002 and the float_compare
use a round UP method thus it returns 0.451 and the following
flow is based on a wrong value.
In this case a float compare is used before the float round, so an
HALF-UP rounding should be okay since a very small quantity diff should
be filter by the compare.

Fixes #24401

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