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

Fix typo in typeof comparison.

Resolves: #67791
Releases: master
Change-Id: If6ad561f87c7071591c3504ee93c6c1027b290a6
Reviewed-on: http://review.typo3.org/40712


Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Tested-by: Xavier Perseguers <xavier@typo3.org>