Fix echo commands

What is your Merge about?

If this is your first merge, please use the Initialization Template.

Fix missing && in series of echo commands that was causing extra strings to be appended to /etc/group

For more information please visit Iron Bank Documentation

Note: Please be sure you create an issue related to this merge request and the issue is labeled ~"Hardening::Review", this will initiate a CHT member review of your merge request.