[FIX] report_purchase: Remove redundancy: Warehouse name and address name

If the goods have to be shipped at the customer premises, the customer address it showed. (nothing changes)
If the goods have to be delivered to the company using Odoo,
* If there is only one warehouse in the company, displaying the warehouse name and address, without the address name, is sufficient.
( the company name is almost always the same, and if it's not, the company name is already displayed in the header )
* If there are multiple warehouses in the company, located at the same address (same partner), the warehouse name helps distinguish the warehouses, unlike address name.
* If there are multiple warehouses in the company, located at different addresses, the warehouse name and address should be sufficient, even without the name of the address.

Also, the warehouse name corresponds to what's displayed in the PO form view.