[TASK] Use new way to register rte wizard

Resolves: #56437
Releases: 6.2
Change-Id: I0eea59f46c74fe50eb2554898a9f64fa2a26a9b1
Reviewed-on: https://review.typo3.org/27951
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel