Cleanup in ext_tables.php

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/sr_language_menu/trunk@76657 735d13b6-9817-0410-8766-e36946ffe9aa
Follow-up to feature #49074: Incorrect paths set in class.ext_update.php

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/sr_language_menu/trunk@76658 735d13b6-9817-0410-8766-e36946ffe9aa