message: fix a typo in Interactable.off
  It should have called `this.events.off`
diff: @@ -299,7 +299,7 @@ class Interactable {
  // if it is an action event type
  if (contains(Interactable.eventTypes, eventType)) {
  - this.events.on(eventType, listener);
  + this.events.off(eventType, listener);
  }
  // delegated event
  else if (isType.isString(this.target)) {
  