Bug 1043347 - [Dialer][Call Screen] Bad alignment of information in conference call overlay

My original comment said 'and then return' :) So we both agree.
I hadn't thought of resetting the lineHeight so good call.

```js
// Don't format if the call is in a conference
if (this.call.group) {
  this.numberNode.style = ''; // We also need to remove any lineHeight previous settings :)
  return;
}
```