[BUGFIX] Make clearable in EM work again

Due to DataTable update, the clearable part did not
work. This patch corrects this issue.

Resolves: #63530
Releases: master
Change-Id: I3855cd99c53b798482cc570ad398de4c480e82bf
Reviewed-on: http://review.typo3.org/34953
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Jigal van Hemert <jigal.van.hemert@typo3.org>
Tested-by: Jigal van Hemert <jigal.van.hemert@typo3.org>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>