[BUGFIX] Removing an element from select field must trigger validation

This patch ensures that re-validation is triggered in case
an element is removed from a select field.

Resolves: #67791
Releases: master
Change-Id: I8b2b6e67216ba9410a3a404fe697064748cd5871
Reviewed-on: http://review.typo3.org/40701


Reviewed-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>