[BUGFIX] Use full class name in makeInstance

Change-Id: I106a8ee054f0bd17dca1e509fa1d6e39be4a53ca
Reviewed-on: http://review.typo3.org/33017
Reviewed-by: Sebastian Fischer <typo3@evoweb.de>
Tested-by: Sebastian Fischer <typo3@evoweb.de>