[BUGFIX] Fix broken require / validation handling for ckeditor

This patch fix the broken require / validation handling for ckeditor.
To revalidate the form, the field is now updated on change and the
validation will be started.

Reolves: #80415
Releases: master
Change-Id: I731ffeb6a7fa217aa2c07004cdb424ea2a20f932
Reviewed-on: https://review.typo3.org/52134


Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>