[BUGFIX] Fix casting in GalleryProcessing data processor

Removing the integer casting, so that the cropVariant can also be a string identifier.

Resolves: #86294
Releases: master, 8.7
Change-Id: Id4a80a7b879ddb8539e8cf4b47eeff1fc111029e
Reviewed-on: https://review.typo3.org/58312


Reviewed-by: Mathias Brodala <mbrodala@pagemachine.de>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Jörg Bösche <typo3@joergboesche.de>
Tested-by: Jörg Bösche <typo3@joergboesche.de>
Reviewed-by: Josef Glatz <josef.glatz@typo3.org>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>