[FW][FIX] point_of_sale: ensure correct display of custom attributes

[fw-bot]

Before this commit, the custom attribute names were not correctly displayed when added to an order.

opw-3795843

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Forward-Port-Of: #158805

[robodoo]

Pull request status dashboard.

[fw-bot]

@pedrambiria @caburj cherrypicking of pull request #158805 failed.

stdout:

Auto-merging addons/point_of_sale/static/src/app/store/models.js
CONFLICT (content): Merge conflict in addons/point_of_sale/static/src/app/store/models.js

stderr:

17:06:13.810080 git.c:463               trace: built-in: git cherry-pick 1709d6da03e75abbf85d7c3e34399e3649277938
error: could not apply 1709d6da03e7... [FIX] point_of_sale: ensure correct display of custom attributes
hint: After resolving the conflicts, mark them with
hint: "git add/rm <pathspec>", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".
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status:

Either perform the forward-port manually (and push to this branch, proceeding as usual) or close this PR (maybe?).

In the former case, you may want to edit this PR message as well.

⚠️ after resolving this conflict, you will need to merge it via @robodoo.

More info at https://github.com/odoo/odoo/wiki/Mergebot#forward-port

[pedrambiria]

robodoo r+