Beautifier: Replace $HOME with it's actual value

Instead of having options texts like "Use file $HOME/abc", $HOME is
eliminated in favor of the actual value of QDir::home().

Change-Id: I9ffe27d73e54a9d30e1f0d4a277fbfbb7969ed45
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Orgad Shaneh <orgads@gmail.com>