Following commit b43151c11c
The order of the pricelist items on the interface was made deterministic, but
there was still a problem with the actual computation because the SQL was
created manually and used a different order than the _order of the model.
Moreover, it is better to use id DESC instead of ASC to make sure the
automatically created default rule matching everything is actually applied last.
PR: #28476
Sébastien Theys
45dec698ee