[TOYS] Fix HelloLaunchOnNewThread print statements

1. Run HelloLaunchOnNewThread on Mac (this may or may not be reproducible on other platforms).
2. Observe that only the following messages are printed initially:

**********************************************************************************************
Main thread exiting: currentThread=main
Calling Application.launch from currentThread=Thread-4
LAUNCHING...Constructor: currentThread=JavaFX Application Thread
init: currentThread=JavaFX-Launcher
start: currentThread=JavaFX Application Thread
**********************************************************************************************

3. The HelloRectangle comes up as expected and works fine.
4. After I press Cmd+Q to exit the app, I see the following output on the console:

**********************************************************************************************
cancel: currentThread=JavaFX Application Thread
DONE: elapsed time = 10522 msec
You should now see the 'HelloWorld' rectangle in the window
**********************************************************************************************

and then the app exits.

I'd expect to see the last line ("You should now see...") to be printed much earlier, when the HelloRectangle is actually displaying on the screen.