[REF] stock_dropshipping: adapt to stock valuation layers

The tests of this module showed multiple issues with the anglos axon
accounting entries creation so we fix them by getting the value on the
valuation layer and not directly on the stock moves.

About the changes in
test_crossdock.py
> To change a standard price, we need to open the wizard
test_lifo_price.py
> To change a standard price, we need to open the wizard + read the
  valuation on the layers.
test_stockvaluation.py
> Now that we create a layer in and out for a dropshipped move, the
accounting entries are similar to an in followed by an out, thus we need
to increment the number of generated AML. Not that the balance of the
accounts stay the same.

There's a slight change in fifo_perpetual_anglosaxon_ordered though.
Let's say for a start that this config doesn't make sense. Ordered means
we don't read the value on the stock move to create the accounting
entries but only the standard price. We had to change 8 by 10 in this
test because, before this task, the standard price was updated when
running fifo, even in dropshipped. As the PO line was valued at 8, the
anglos axon in stock out was at 8 because the standard price was changed
to 8 after the delivery.

task-1875873

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