Include app name in JavaFX Launcher error message

In the event of a JavaFX Launcher error, a message is shown to allow the end user to download/install the required version of JavaFX. This message does not include the app name requesting JavaFX, so in the web start case the user might not be able to associate it with a particular app or web page. The simplest fix would be to add the name to the window title: "<app name> - JavaFX Launcher"