[BUGFIX] Remove update wizard of css_styled_content

With #80876 an update wizard has been removed but its reference
in the ext_localconf.php must be removed as well.

Resolves: #80949
Releases: master
Change-Id: I7ff7a616dffe9670c23e80fb8e4dbbf67119c494
Reviewed-on: https://review.typo3.org/52549


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>