[FIX] website_sale_digital: search domain for attachment count
[FIX] website_sale_digital: search domain for attachment count

Before this commit, the search domain returns no results.

Fine-tuning of 62c9dedafda0cbdc618641eaa80c49535ab0b5f6

opw-2172563

X-original-commit: f3d178c329eeb4d840c24801247fc5da39df998c
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo