[stable29] fix: csrf check failed on public share with password

[backportbot[bot]]

Backport of #44369

Warning, This backport's changes differ from the original and might be incomplete ⚠️

Todo

• [ ] Review and resolve any conflicts
• [ ] Remove all the empty commits

---

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.