Fixed StartController countdown

- Removed obsolete timer related code
- Consistently use RaceClock throughout StartController

#story[782]

visualiser/src/main/java/seng302/Controllers/StartController.java

@@ -96,7 +96,6 @@ public class StartController extends Controller implements Observer {
 
     /**
      * Countdown timer until race starts. Use PRERACE_TIME to set countdown duration.
-     * @param scaleFactor factor to scale by
      */
     protected void countdownTimer() {
         new AnimationTimer() {
@@ -118,6 +117,7 @@ public class StartController extends Controller implements Observer {
                         updateTime(String.format("Race starts in: %d:%02d:%02d", seconds / 3600, (seconds % 3600) / 60, (seconds % 60)));
                     }
                 }
+            }
         }.start();
     }