[!!!][CLEANUP] Remove deprecated code in sysext fluid

Resolves: #53542
Releases: master
Change-Id: I9c90dae141a6cf1cf6871ad70d0de4905ab8e1ec
Reviewed-on: http://review.typo3.org/33769
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>