[FIX] stock: Don't take into account canceled moves to check for backorder

Do a transfer in two steps with several move lines (e.g.: Vendors => Input => Stock).

In the first picking, set quantity = 0 on a single line. Transfer it and say 'No backorder'.

In the second picking, set all quantities (you have two move lines confirmed and one canceled). Validate the
transfer. The backorder wizard is launched. It should not.

closes odoo/odoo#66122

Signed-off-by: Arnold Moyaux <amoyaux@users.noreply.github.com>