[FIX] point_of_sale: only set qty_done on non-tracked products
[FIX] point_of_sale: only set qty_done on non-tracked products

The POS attempts to auto-validate pickings and so it sets qty_done of
the pack operations to equal product_qty. In the case of a pack
operation about a tracked product this doesn't make much sense, as in
that case auto-validation will fail and serial/lot numbers have to be
manually specified by the user. Without this patch you end up with pack
operations that look like they're done, but still need to have
serial/lot numbers set.

opw-690516

dfang/odoo,dfang/odoo,dfang/odoo,Elico-Corp/odoo_OCB,laslabs/odoo,bplancher/odoo,dfang/odoo,storm-computers/odoo,bplancher/odoo,bplancher/odoo,hip-odoo/odoo,Elico-Corp/odoo_OCB,microcom/odoo,ygol/odoo,hip-odoo/odoo,laslabs/odoo,storm-computers/odoo,laslabs/odoo,microcom/odoo,Elico-Corp/odoo_OCB,hip-odoo/odoo,bplancher/odoo,microcom/odoo,storm-computers/odoo,ygol/odoo,hip-odoo/odoo,microcom/odoo,laslabs/odoo,ygol/odoo,ygol/odoo,dfang/odoo,ygol/odoo,storm-computers/odoo,dfang/odoo,Elico-Corp/odoo_OCB,laslabs/odoo,Elico-Corp/odoo_OCB,bplancher/odoo,microcom/odoo,ygol/odoo,Elico-Corp/odoo_OCB,storm-computers/odoo,hip-odoo/odoo,laslabs/odoo,microcom/odoo,storm-computers/odoo,bplancher/odoo,ygol/odoo,hip-odoo/odoo