7124326: [macosx] An issue similar to autoshutdown one in two AppContexts situation.

Summary: Don't add SystemTrayPeer to the peers map
Reviewed-by: art, leonidr

src/macosx/classes/sun/lwawt/macosx/LWCToolkit.java

@@ -216,7 +216,6 @@ public class LWCToolkit extends LWToolkit {
     @Override
     public SystemTrayPeer createSystemTray(SystemTray target) {
         SystemTrayPeer peer = new CSystemTray();
-        targetCreatedPeer(target, peer);
         return peer;
     }