[17.0][FW] [16.0][FIX] account_payment_partner: payment mode compute

[sebalix]

Port of #1252 from 16.0 to 17.0.

[sebalix]

cc @ljsalvatierra-factorlibre @pedrobaeza @aritzolea

[pedrobaeza]

Thanks for bringing these patches to latest branches, and it's a claiming action for those doing patches and not forward-porting them.

Fast-tracking it:

/ocabot merge patch

[OCA-git-bot]

Hey, thanks for contributing! Proceeding to merge this for you.
Prepared branch 17.0-ocabot-merge-pr-1356-by-pedrobaeza-bump-patch, awaiting test results.

[OCA-git-bot]

@pedrobaeza The merge process could not be finalized, because command git push origin 17.0-ocabot-merge-pr-1356-by-pedrobaeza-bump-patch:17.0 failed with output:

To https://github.com/OCA/bank-payment
 ! [rejected]          17.0-ocabot-merge-pr-1356-by-pedrobaeza-bump-patch -> 17.0 (fetch first)
error: failed to push some refs to 'https://github.com/OCA/bank-payment'
hint: Updates were rejected because the remote contains work that you do not
hint: have locally. This is usually caused by another repository pushing to
hint: the same ref. If you want to integrate the remote changes, use
hint: 'git pull' before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.

[OCA-git-bot]

Congratulations, your PR was merged at 0ed68c3. Thanks a lot for contributing to OCA. ❤️