[TASK] Remove unused variable from FeatureManager->getBestMatchingConfigurationForAllFeatures

Removed the variable $featureName as it is never used.

Resolves: #62637
Releases: master
Change-Id: I5125d59d4acdf5aca77eb7b4aa11cbcb9cc5217b
Reviewed-on: http://review.typo3.org/33739
Reviewed-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Tested-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>