[BUGFIX] Use correct check for disabled field in DataHandler

Instead of checking for the array key `enablecolumns` the check must be
done on the field `disabled` itself.

Resolves: #97728
Releases: main, 11.5
Change-Id: I411b37d4d63eb1ad52592cd887a95c2552ab7bfa
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/74762


Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>