Only return display name as editable when the user backend allows it#26461

MorrisJobke merged 2 commits intomasternextcloud/server:masterfrom

bugfix/noid/only-return-editable-displayname-field-when-allowed-by-backendnextcloud/server:bugfix/noid/only-return-editable-displayname-field-when-allowed-by-backendCopy head branch name to clipboard