[BUGFIX] Make the buttons in the last "duplicate form" step clickable

Cleanup the last "duplicate form" wizard code and make the
buttons in the last "duplicate form" wizard step clickable.

Resolves: #94860
Releases: master
Change-Id: Ib6dac66cc3a3860fb380ee7028890acb08890f36
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70527


Tested-by: Björn Jacob <bjoern.jacob@tritum.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Andreas Steiger <typo3@andreassteiger.de>
Tested-by: waldhacker <hello@waldhacker.dev>
Reviewed-by: Björn Jacob <bjoern.jacob@tritum.de>
Reviewed-by: Andreas Steiger <typo3@andreassteiger.de>
Reviewed-by: waldhacker <hello@waldhacker.dev>