[TASK] Cleanup convertParameterReflectionToArray()

ReflectionService::convertParameterReflectionToArray() checks
functions already returning boolean again for boolean value.

Remove this overhead and improve readability.

Change-Id: I113f16cd73c713da5ec75b0e57eeee1d0e17308c
Resolves: #54021
Releases: 6.2
Reviewed-on: https://review.typo3.org/25717
Reviewed-by: Markus Klein
Tested-by: Markus Klein