[BUGFIX] Mark form as changed after using the image cropper

[BUGFIX] Mark form as changed after using the image cropper

The image cropper now marks the form as "changed" after saving new
cropping information.

Resolves: #86998
Releases: master, 9.5, 8.7
Change-Id: Ia6a6abeb88b1d9a590e76b50890ebcbac16f7472
Reviewed-on: https://review.typo3.org/59166
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Josef Glatz <josef.glatz@typo3.org>
Reviewed-by: Guido Schmechel <guido.schmechel@brandung.de>
Tested-by: Guido Schmechel <guido.schmechel@brandung.de>
Tested-by: Josef Glatz <josef.glatz@typo3.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>