[BUGFIX] Fix spelling error in form

In #90264 the datepicker JS was moved to an external
file. A new YAML configuration has been introduced.
Unfortunately, a nasty spelling error sliped in which
has been fixed now.

Resolves: #94846
Related: #90264
Releases: master
Change-Id: I02fdd858b92afebb10295f241c9b8cdf5d10108b
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70498


Tested-by: core-ci <typo3@b13.com>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Oliver Bartsch <bo@cedev.de>