[FIX] website_sale: avoid displaying inactive products in shops

The domains in the form ('o2m_field', operator, False) do not use the orm but convert the domain to ('id', 'invert operator', [list of ids]). This means that the orm is not used and implicit filter (active=True) or access rights are not checked.
A proper fix in master should be done to use the orm instead of an SQL query.
This patch force a search to be made on product.product and then exclude the products where active=False (opw 607602).