[FIX] membership: Adapt customer and supplier filters
[FIX] membership: Adapt customer and supplier filters

The fieds `customer` and `supplier` no longer exist
since 3e97cff.

But 9a0fedf re-introduced filters using those fields,
probably when rebasing the branch.

closes odoo/odoo#36165

Signed-off-by: Yannick Tivisse (yti) <200a91eb0e5cc4726d6a3430713b580138f34298@odoo.com>
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo