Use dashes instead of nothing for spaces
I'm a bit afraid that if we end up having a lot of scripts in this repository, we'll also end up with ugly script names like
addedxuserandsetupedx-cloud-init becaue the norm up until now has been to remove spaces from folder and script names.
This MR changes
jitsi-meet, which is also more consistent with the
-cloud-init already available in a bunch of files.