[BUGFIX] Localconf upgrade wizard fails

Converting localconf.php to LocalConfiguration.php
with the installtool upgrade-wizard fails on
Debian Squeeze installation.

Change-Id: Id06793fc487cd1ad6b1d56ca5ee5a99960b3f4b1
Resolves: #39434
Releases: 6.2, 6.1, 6.0
Reviewed-on: https://review.typo3.org/22349
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring