[TASK] Followup: Migrate FormEngine Checkboxes HTML to twbs

The disabled class on the wrapping div was missing.

Resolves: #62975
Related: #62973
Releases: master
Change-Id: I79e54a8c245a1e6a88ff5aefd99adccc52d561cc
Reviewed-on: http://review.typo3.org/35478
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>