[BUGFIX] Properly render multiline form values

Properly render multiline form values in summary page
and HTML emails.

Resolves: #82026
Releases: master, 8.7
Change-Id: Ic0d9cca3712437cd4625a4644355f77db8f01587
Reviewed-on: https://review.typo3.org/53950


Reviewed-by: Mathias Brodala <mbrodala@pagemachine.de>
Tested-by: Mathias Brodala <mbrodala@pagemachine.de>
Reviewed-by: Ralf Zimmermann <ralf.zimmermann@tritum.de>
Tested-by: Ralf Zimmermann <ralf.zimmermann@tritum.de>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>