cmd/rpcfetch: update replace counter in ui thread

cmd/rpcfetch/apply.go

@@ -60,10 +60,8 @@ type applyState struct {
 func (s *applyState) replace(t string) string {
 	for k, f := range substitute {
 		t = strings.ReplaceAll(t, "%"+k, f(s))
-		go func() {
 		replCounter.Add(uint64(len(t)))
 		statusReplaces.SetText(strconv.Itoa(int(replCounter.Load())) + " bytes")
-		}()
 	}
 	return t
 }