fix:修改降级+保活模式下，ant-design-vue按钮点击事件丢失问题 #997
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ant-design-vue按钮组件有一个点击水波纹效果，在按钮点击的时候，会先清除一次事件监听，这时wujie在缓存事件时，会进入iframeWindow.Node.prototype.removeEventListener函数里面，由于时间还未监听，index为-1时，elementListenerList.splice(index, 1)错误的移除了其他事件，加入一个判断就好了
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ant-design-vue按钮组件有一个点击水波纹效果，在按钮点击的时候，会先清除一次事件监听，这时wujie在缓存事件时，会进入iframeWindow.Node.prototype.removeEventListener函数里面，由于事件还未监听，index为-1时，elementListenerList.splice(index, 1)错误的移除了其他事件，加入一个判断就好了
npm run test通过详细描述