Fix SimpleActorTest

The CPS already gets incremented by the
SynchronizedFiber. Initializing the CPS with FIBER_COUNT means that
the CPS will never become ready.

tests/SimpleActorTest.cpp

@@ -37,7 +37,7 @@ static void mainFiber(void* runtime_ptr) {
 	SumActor sumActor(runtime);
 	sumActor.start();
 
-	CPS cps(FIBER_COUNT);
+	CPS cps;
 	for (unsigned int i = 0; i < FIBER_COUNT; ++i) {
 		spawn([&sumActor, i] {
 				WDBG(Dispatcher::getCurrentFiber() << " starts to count to " << FIBERS_COUNT_TO);