[BUGFIX] Remove unused variable in DataHandler

Resolves: #87384
Related: #87294
Releases: master
Change-Id: If9cba4db4efc8f1c8e1be5c501450e1a18d87235
Reviewed-on: https://review.typo3.org/59393
Tested-by: TYPO3com <noreply@typo3.com>
Reviewed-by: Josef Glatz <josef.glatz@typo3.org>
Tested-by: Josef Glatz <josef.glatz@typo3.org>
Reviewed-by: Fabien Udriot <fabien.udriot@ecodev.ch>
Tested-by: Fabien Udriot <fabien.udriot@ecodev.ch>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>