[FIX] l10n_it_stock_ddt: support dropshipping in ddt

Have an IT company configured
Activate Dropship
Create a Product P with dropship enabled and vendor configured
Create a quotation to an IT customer, add P to a line, confirm.
Purchase will be created automatically, confirm it.
Go to dropship picking, confirm, print

The DDT report does not show up correctly:
- Warehouse address is the company address
- Customer address is the vendor address

opw-3128812

Part-of: odoo/odoo#110398