[BUGFIX] Use correct type for header value

Resolves: #86758
Releases: master
Change-Id: Ia0803d4ba68e0913478e4cfa9173cce5e1c5b5db
Reviewed-on: https://review.typo3.org/58723


Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Joerg Kummer <typo3@enobe.de>
Tested-by: Joerg Kummer <typo3@enobe.de>
Reviewed-by: Jürgen Heym <juergen.heym@hof-university.de>
Tested-by: Jürgen Heym <juergen.heym@hof-university.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>