[BUGFIX] Fixed typo in getTypoScriptSetup()

Change-Id: I9d25c61849541b74a8e45f03e868fa69eb4330d3
Resolves: #60671
Reviewed-on: http://review.typo3.org/31907
Reviewed-by: Jo Hasenau <info@cybercraft.de>
Tested-by: Jo Hasenau <info@cybercraft.de>