[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

addons/point_of_sale/point_of_sale.py

@@ -957,7 +957,7 @@ class pos_order(osv.osv):
         picking_obj.force_assign(cr, uid, [picking_id], context=context)
         # Mark pack operations as done
         pick = picking_obj.browse(cr, uid, picking_id, context=context)
-        for pack in pick.pack_operation_ids:
+        for pack in pick.pack_operation_ids.filtered(lambda pack: pack.product_id.tracking == 'none'):
             self.pool['stock.pack.operation'].write(cr, uid, [pack.id], {'qty_done': pack.product_qty}, context=context)
         picking_obj.action_done(cr, uid, [picking_id], context=context)