fix(timing): prevent duplicate timer creation by canceling existing timer

SceneMgr.js

@@ -189,6 +189,9 @@ class Scene {
             tm.reschedule(timerUID, timeout);
         } else {
             log.info(`Create timer to evaluate scene ${sceneName}`);
+            if (tm.hasTimer(timerUID)) {
+                tm.cancel(timerUID);
+            }
             tm.create(timerUID, timeout, evaluate);
         }