[FOLLOWUP][FEATURE] Streamline Fluid Styled Content and CSS Styled Content

Removed use of undefined variable.

Resolves: #79622
Related: #79622
Releases: master
Change-Id: I91935ec80e2ff2963dce5b6bbccbaaa52cd186c3
Reviewed-on: https://review.typo3.org/51607


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Mona Muzaffar <mona.muzaffar@gmx.de>
Reviewed-by: Thomas Hohn <thomas@hohn.dk>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>