Revert "[BUGFIX] Use correct fallback types in ImageDimension"

This reverts commit 88a8a246.

Reason for revert: Accidentally merged without enough votes. Mixed up with a backport.

Change-Id: Ice9ccc3cf27758673358f1b6501c3f71130e732d
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/75149


Tested-by: core-ci <typo3@b13.com>
Tested-by: Jochen <rothjochen@gmail.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Jochen <rothjochen@gmail.com>
Reviewed-by: Oliver Bartsch <bo@cedev.de>

typo3/sysext/core/Classes/Imaging/ImageDimension.php

@@ -81,8 +81,8 @@ class ImageDimension
                 $imageDimension->height,
                 $processedFile->getExtension(),
             ],
-            (string)($config['width'] ?? ''),
-            (string)($config['height'] ?? ''),
+            $config['width'] ?? null,
+            $config['height'] ?? null,
             $config
         );
         $imageWidth = $geometryWidth = (int)$result[0];