[TASK] Replace confirm in FormEngine->Flex->Section remove

Resolves: #71723
Releases: master
Change-Id: Iee94e6609f813b96111ce251b426c5f0ae76453b
Reviewed-on: https://review.typo3.org/44821


Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>