[FIX] stock_account: False currency exchange on interim receipt

Usecase to reproduce:
- Set the currencies as 1€ = 2$ ($ as company currency)
- Create a PO for a product in AVCO auto with a price of 100€
- Do the receipt
- Change the rate as 1€ = 4$
- Bill the PO

Expected behavior:
- One correction account.move.line for the 200$ and the stock
interim receipt account reconciled.

Current behavior:
- An aml from the price difference with the 200$
- Another from the currency exchange also for 200$
- The line from the price diff is not reconcile

`_stock_account_anglo_saxon_reconcile_valuation` should never reconcile
account.move.line from a price difference correction without the context
key no_exchange_difference because the currency correction is already
handle in the correction layer.

closes odoo/odoo#118626

Signed-off-by: William Henrotin (whe) <whe@odoo.com>