[FIX] point_of_sale: picking breadcrump display name

When clicking on the picking smart button through the `pos.order` and the `pos.session` views,
the displayed name shown was "To do" instead of "Pickings"

closes odoo/odoo#107131

X-original-commit: d65d61e5
Signed-off-by: Joseph Caburnay (jcb) <jcb@odoo.com>
Signed-off-by: Trinh Jacky (trj) <trj@odoo.com>