fix(files_versions): "undefined restored" on restore

[xlejo]

• Resolves: [Bug]: "undefined restored" when restoring a previous version of a file #37055

Summary

Solves the success message "undefined restored" when restore a file.

This issue was already solved in pull request #49664, but wasn't merged.

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[skjnldsv]

Thanks for the PR @xlejo !

I renamed your commit with a proper [conventional commit] (https://www.conventionalcommits.org/en/v1.0.0/#summary), please adjust next time 😉

[skjnldsv]

/backport to stable30

[skjnldsv]

/backport to stable31

[welcome]

Thanks for your first pull request and welcome to the community! Feel free to keep them coming! If you are looking for issues to tackle then have a look at this selection: https://github.com/nextcloud/server/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22

[skjnldsv]

/backport ab11868 to stable30

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