[FIX] website_sale_digital: search domain for attachment count

Before this commit, the search domain returns no results.

Fine-tuning of 62c9deda

opw-2172563

X-original-commit: f3d178c329eeb4d840c24801247fc5da39df998c

addons/website_sale_digital/models/product.py

@@ -40,8 +40,8 @@ class Product(models.Model):
         for product in self:
             product.attachment_count = self.env['ir.attachment'].search_count([
                 '|',
-                ('res_model', '=', 'product.template'), ('res_id', '=', product.product_tmpl_id.id), ('product_downloadable', '=', True),
-                ('res_model', '=', 'product.product'), ('res_id', '=', product.id), ('product_downloadable', '=', True)])
+                '&', '&', ('res_model', '=', 'product.template'), ('res_id', '=', product.product_tmpl_id.id), ('product_downloadable', '=', True),
+                '&', '&', ('res_model', '=', 'product.product'), ('res_id', '=', product.id), ('product_downloadable', '=', True)])
 
     def action_open_attachments(self):
         self.ensure_one()