[grid] We do not need to stop the session again

If we get a `SessionClosedEvent`, it means that
the `SessionSlot` already stopped the session
so there is no need to invoke `this.stop(id)`
again.

Author: diemol

java/src/org/openqa/selenium/grid/node/local/LocalNode.java

@@ -175,10 +175,7 @@ private LocalNode(
     regularly.submit(() -> bus.fire(new NodeHeartBeatEvent(getStatus())), heartbeatPeriod, heartbeatPeriod);
 
     bus.addListener(SessionClosedEvent.listener(id -> {
-      try {
-        this.stop(id);
-      } catch (NoSuchSessionException ignore) {
-      }
+      // Listen to session terminated events so we know when to fire the NodeDrainComplete event
       if (this.isDraining()) {
         int done = pendingSessions.decrementAndGet();
         if (done <= 0) {