Bugfix in addFlashMessage

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/th_rating/trunk@85776 735d13b6-9817-0410-8766-e36946ffe9aa
Commit for version 0.11.0

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/th_rating/trunk@85777 735d13b6-9817-0410-8766-e36946ffe9aa