[14.0] invoice_plan invoice date different to account movement date

[francescapenso]

Case Description:
a sales order is created (e.g. 08/15/2023)
On September 1st I want to issue an invoice by creating an invoice_plan in which the first invoice is dated 08/31/2023
I create invoice by plan, the invoice have the date 08/31/2023 but the accounting entry date 09/01/2023

[francescapenso]

Adding thies row to the file, it seems it works fine sale_invoice_plan/models/sale.py

I supposed that in date=none move.dave= 'today' and it's wrong