[FIX] mass_mailing: don't forward context
[FIX] mass_mailing: don't forward context

Don't forward context from mass mailing to partners view.
When grouping mass mailing by state, passing context makes
Odoo trying to group partners by state, and then get a traceback.

closes odoo/odoo#27775
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo