fix(TabBar): change event is invalid under skyline (#3926)

Author: anlyyao

packages/components/tab-bar/tab-bar.less

@@ -14,6 +14,7 @@
   font-size: 16px;
   background-color: @tab-bar-bg-color;
   box-sizing: border-box;
+  pointer-events: auto;
 
   &--normal&--border::before {
     z-index: 1;