[TASK] Adjust colorpicker wizard registration

Since #56268 there is a new way of registering wizards. Adjust
the colorpicker to this new way of registering.

Resolves: #56459
Releases: 0.6
Change-Id: I5784d5bbf4a98ae468da802d6d76bffe2180a3c4
Reviewed-on: https://review.typo3.org/27965
Reviewed-by: Francois Suter
Tested-by: Francois Suter