[FIX] sale_coupon: expected singleton archiving coupon
[FIX] sale_coupon: expected singleton archiving coupon

Before this commit, There was expected singleton tracback on Archiving multiple Coupons at once.
With this commit, We are passing single Record to process.

This is manual Forward port of https://github.com/odoo/enterprise/pull/9637
(Coupons modules went from OE to OC in saas-12.3)

closes odoo/odoo#48996

X-original-commit: d8c2c7269560920511598414741ad42e1f7a0213
Signed-off-by: Romain Derie <a9a1578f1a6d5b390f1e6505f5f716509d49a3ed@users.noreply.github.com>

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