[BUGFIX] Avoid PHP 8 warning when converting crop in Image ViewHelpers

Resolves: #101185
Releases: main, 12.4, 11.5
Change-Id: If54f9308ac2928ce9521228593d6a3ef88713d51
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/81157


Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>