Update worlddb.cpp fixes git fatal error due to typo

[nazwadi]

git command had a duplicate "rev-parse" argument that was causing a fatal error to that git command during launch of world process.

You can reproduce this by commenting out the /dev/null redirection in the EQServer.sh launch script and observing the message in stderr.

[regneq]

ah I don't think we ever used it. but that is a nice fix. thank you.