Fix se/numberguess example with SecurityManager enabled

Exception in thread "main" java.lang.SecurityException: java.lang.SecurityException: setContextClassLoader
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at java.util.concurrent.ForkJoinTask.getThrowableException(ForkJoinTask.java:593)
	at java.util.concurrent.ForkJoinTask.get(ForkJoinTask.java:1005)
	at org.jboss.weld.executor.AbstractExecutorServices.checkForExceptions(AbstractExecutorServices.java:73)
	at org.jboss.weld.executor.AbstractExecutorServices.invokeAllAndCheckForExceptions(AbstractExecutorServices.java:59)
	at org.jboss.weld.executor.AbstractExecutorServices.invokeAllAndCheckForExceptions(AbstractExecutorServices.java:67)
	at org.jboss.weld.bootstrap.ConcurrentBeanDeployer.addClasses(ConcurrentBeanDeployer.java:52)
	at org.jboss.weld.bootstrap.BeanDeployment.createClasses(BeanDeployment.java:198)
	at org.jboss.weld.bootstrap.WeldStartup.startInitialization(WeldStartup.java:406)
	at org.jboss.weld.bootstrap.WeldBootstrap.startInitialization(WeldBootstrap.java:79)
	at org.jboss.weld.environment.se.Weld.initialize(Weld.java:798)
	at org.jboss.weld.environment.se.example.numberguess.Main.main(Main.java:10)
Caused by: java.lang.SecurityException: setContextClassLoader
	at java.util.concurrent.ForkJoinWorkerThread$InnocuousForkJoinWorkerThread.setContextClassLoader(ForkJoinWorkerThread.java:244)
	at org.jboss.weld.executor.CommonForkJoinPoolExecutorServices.lambda$wrap$0(CommonForkJoinPoolExecutorServices.java:68)
	at java.util.concurrent.ForkJoinTask$AdaptedCallable.exec(ForkJoinTask.java:1424)
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)