[FEATURE] default mailform: dont include honeypot field in email

Resolves: #61854
Releases: 6.2
Change-Id: I6f702690ceca0425b4e3e0a5d6b4d1f98dfa6007
Reviewed-on: http://review.typo3.org/32959
Reviewed-by: Ralf Zimmermann <ralf.zimmermann@tritum.de>
Tested-by: Ralf Zimmermann <ralf.zimmermann@tritum.de>