LESS mixins gets formatted strangely

[corgrath]

Given code like this:

.mq-medium( {
    position: absolute;
    background: red;
});

It ends up like this by the CSS Beautifier formatter:

.mq-medium( {
    position: absolute;
    background: red;
}
);

It still works, but it just looks a bit strange that } and ); ends up on their own rows.

[bitwiseman]

Need to look at bugfix by @corgrath. See if it works in general.