message: Small bugfix in Go generator for LROs.
  Fixed a missed case in the recent LRO feature work.
diff: @@ -139,7 +139,7 @@ namespace AutoRest.Go.Model
  // for LROs return the response types via a channel.
  // only do this for the "real" API; for "helper" methods
  // i.e. preparer/sender/responder don't use a channel.
  - if (!helper && IsLongRunningOperation())
  + if (!helper && ReturnViaChannel)
  {
  retVal = $"<-chan {retValType}";
  errVal = "<-chan error";
  