a8n: Remove duplicated waitgroup.Wait() in Runner
Created by: mrnugget
@efritz spotted this. This is wrong. We only want to wait in the Wait()
method of the Runner. I introduced this in #6598.
Created by: mrnugget
@efritz spotted this. This is wrong. We only want to wait in the Wait()
method of the Runner. I introduced this in #6598.