Clear the console line as well

Useful in the instance that the line from the console input buffer is larger than the incoming text to the jline console.

Kinda bothered me when I was developing BotSy and was tinkering with jline2, and I noticed that Spout suffered from the same effect. Really noticeable when you have a long command with a lot of parameters, and the console updates - you'll see it isn't entirely cleared.