[FIX] mrp_subcontracting: correct type for view registry
[FIX] mrp_subcontracting: correct type for view registry

When the action is called by a javascript function the view
is not correctly rendered because the tree type does not exist
in the registry but the correct type is list.
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo