Return to menu on simulator after event, exit on device

Split _dismiss() into (:debug) popView and (:release) System.exit
so simulator testing stays fluid while device behavior is unchanged.

source/SuccessView.mc

@@ -26,6 +26,12 @@ class SuccessView extends WatchUi.View {
         _timer.stop();
     }
 
+    (:debug)
+    function _dismiss() as Void {
+        WatchUi.popView(WatchUi.SLIDE_RIGHT);
+    }
+
+    (:release)
     function _dismiss() as Void {
         System.exit();
     }