update ace/ace_ets_component_two/entry/src/main/ets/MainAbility/pages/imageAnimator.ets.

Signed-off-by: N陈宇怀 <chenyuhuai1@huawei.com>

ace/ace_ets_component_two/entry/src/main/ets/MainAbility/pages/imageAnimator.ets

@@ -97,7 +97,7 @@ struct ImageAnimatorExample {
           console.info('Finish')
         })
       Row() {
-        Button('start').key('button').width(100).padding(5).onClick(() => {
+        Button('start').key('buttonStart').width(100).padding(5).onClick(() => {
           this.state = AnimationStatus.Running
           try {
             var backData = {