[BUGFIX] Properly name hook class

The hook class must be properly named
so that it can be found by the class loader

Change-Id: Ie97f0891da69186dd444889b9376e4f24c124721
Resolves: #58035
Reviewed-on: https://review.typo3.org/29557
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer