[BUGFIX] Fixed typo in getTypoScriptSetup()

Change-Id: I89e792f18a9e4cf3ed906f895c2a5e01c23a6564
Resolves: #60671
Reviewed-on: http://review.typo3.org/31906
Reviewed-by: Jo Hasenau <info@cybercraft.de>
Tested-by: Jo Hasenau <info@cybercraft.de>