Fix: use double / in strings

[theking2]

Summary

In PHP single quote string \ need to be escaped.

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)

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[DaphneMuller]

@nfebe could you give this a review please so it can be merged?

[nfebe]

Looks good, thank you.

[nfebe]

@theking2 I updated the branch for you with rebase, please fix the commit using conventional commits

I can't push to your branch, so you have to fix it yourself so this can be merged. Thank you.

[skjnldsv]

I can't push to your branch, so you have to fix it yourself so this can be merged. Thank you.

done

[skjnldsv]

/backport to stable31

[skjnldsv]

/backport to stable30

[DaphneMuller]

@skjnldsv @nfebe can this be merged?

[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