[stable30] fix(core): correctly show displayname when picking a file

[backportbot[bot]]

Backport of #53291

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

Todo

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

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

[AndyScherzinger]

/compile

[susnux]

/compile