[FIX] sale_stock: fix onchange product_uom_qty

opw-1916064

Have a sales order line on which you decrease the quantity.
Before, this commit, the warning message that says to update the
delivery order did not show. This was because, the onchange in the
python side compared the new quantity against the saved one, and did
not find any difference. This is caused by the onchange itself, which,
in a o2m setting, received from the JS, the changed order
(already containing the changed line) and only then proceeded to the
onchange of the line. The first operation wrote onto _origin the new
line value, which corresponded subsequently to the new value.

After this commit, we compare the real value explicitly retrieved from
the database to the one just entered by the user as an onchange.
The warning message works as expected.

Long story short, _origin in an onchange doesn't guarantee to yield
persisted values in all cases.

closes odoo/odoo#29582

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