[BUGFIX] Validation in formengine without leaving field

Fix validation problem for input fields.

Resolves: #68599
Releases: master
Change-Id: I8e4f77d7c2b68d2f1e36ef52ad3bef3bf0d51a58
Reviewed-on: http://review.typo3.org/42075


Reviewed-by: Josef Glatz <jousch@gmail.com>
Tested-by: Josef Glatz <jousch@gmail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>