[BUGFIX] Correct VH name in HtmlentitiesDecodeViewHelperTest

Fluid Viewhelper class name resolution is case sensitive.
The patch fixes a cases where f:format.htmlentitiesdecode
is used instead of f:format.htmlentitiesDecode (upper case D).

Resolves: #95530
Releases: master
Change-Id: I6742dc05f6cfba9b8908f5dbf12c21b16e17d26e
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/71492


Tested-by: Simon Schaufelberger <simonschaufi+typo3@gmail.com>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Simon Schaufelberger <simonschaufi+typo3@gmail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>