Don't set a penalty time when doing DNS lookups

Don't set a penalty time when doing DNS lookups

The logic isn't as described in the source and intended by this code:
ngIRCd doesn't wait for the asynchronous resolver process until the set
penalty time is over, but until the forked process terminates or the
initial connection timeout (= PongTimeout) triggers.

So don't set the penalty time at all and remove the wrong comment.