[BUGFIX] Remove backdrop of cropper modal properly

Remove the `remove()` call when the cropper modal gets
closed.

Resolves: #67030
Related: #66969
Releases: master
Change-Id: Ibec6f8ee803ce4b4d6528367f25608cf0b38e21f
Reviewed-on: http://review.typo3.org/39617


Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Frans Saris <franssaris@gmail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>

typo3/sysext/backend/Resources/Public/JavaScript/ImageManipulation.js

@@ -266,7 +266,7 @@ define('TYPO3/CMS/Backend/ImageManipulation', ['jquery', 'TYPO3/CMS/Backend/Moda
 	 */
 	ImageManipulation.dismiss = function() {
 		if (ImageManipulation.currentModal) {
-			ImageManipulation.currentModal.modal('hide').remove();
+			ImageManipulation.currentModal.modal('hide');
 			ImageManipulation.currentModal = null;
 		}
 	};