[stable28] fix(files): selected files actions position on scroll/with readme block

[backportbot[bot]]

Backport of #43172

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

Todo

• [ ] Review and resolve any conflicts

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

[ShGKme]

/compile

[ShGKme]

@skjnldsv Can we merge it during the freeze as it has no translations/design changes and fixes a bug that is already in stable28?

[skjnldsv]

@skjnldsv Can we merge it during the freeze as it has no translations/design changes and fixes a bug that is already in stable28?

sorry missed this, the answer was no, to be safe :)