[FIX] website: add website in attachment list view if multi-websites
[FIX] website: add website in attachment list view if multi-websites

The list view of ir.attachment was missing the website field if multi-websites
was enabled.

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo