[TASK] Remove dummy files in EXT:form

Change-Id: I80169971a48e43f1aa82d01dfb7a328807a74f30
Resolves: #47802
Related: #47756
Releases: 6.2
Reviewed-on: https://review.typo3.org/20397
Reviewed-by: Felix Kopp
Tested-by: Felix Kopp
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn