Changed cmus-info to use format and message

This used to use echo-streen and cat, but I condensed it to use format
and message. Also I put newlines inside the let statement so it's more
readable. That might be a subjective statement though.
Updated cmus-query to use let* instead of let

The way that cmus-query was using let seemed to lend itself better to
let*, so I updated it to use that instead.