sw/src/demo.cpp:DemoPlayBack: Add a call to timerUpdateClock, which

is now required. Previously, it would be called from faketimerhandler,
which in turn is called from the engine.

source/sw/src/demo.cpp

@@ -451,6 +451,8 @@ DemoPlayBack(void)
 
     while (TRUE)
     {
+        timerUpdateClock();
+
         // makes code run at the same rate
         while (totalclock > totalsynctics)
         {