message: fix Tab snapshot
diff: @@ -200,7 +200,7 @@ exports[`renders demo correctly 1`] = `
  <div class="van-tabs__line"></div>
  </div>
  </div>
  - <div class="van-tabs__content">
  + <div class="van-tabs__content van-tabs__content--animated">
  <div class="van-tabs__track" style="left:0%;transition-duration:0.3s;">
  <div class="van-tab__pane">
  <!---->
  