[FIX] product_variant_default_code: code_prefix in reference_mask

[RabbitJon-S73]

Cherry-picked from v14 #293

[OCA-git-bot]

Hi @Kev-Roche,
some modules you are maintaining are being modified, check this out!

[RabbitJon-S73]

@sebastienbeau @pedrobaeza

[pedrobaeza]

/ocabot merge patch

[OCA-git-bot]

What a great day to merge this nice PR. Let's do it!
Prepared branch 16.0-ocabot-merge-pr-300-by-pedrobaeza-bump-patch, awaiting test results.

[OCA-git-bot]

@pedrobaeza The merge process could not be finalized, because command git push origin 16.0-ocabot-merge-pr-300-by-pedrobaeza-bump-patch:16.0 failed with output:

To https://github.com/OCA/product-variant
 ! [rejected]        16.0-ocabot-merge-pr-300-by-pedrobaeza-bump-patch -> 16.0 (fetch first)
error: failed to push some refs to 'https://***@github.com/OCA/product-variant'
hint: Updates were rejected because the remote contains work that you do
hint: not have locally. This is usually caused by another repository pushing
hint: to the same ref. You may want to first integrate the remote changes
hint: (e.g., '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 7848e4a. Thanks a lot for contributing to OCA. ❤️