在Ellipsis组件和antd的Table组件共用时存在样式问题 (#2405)

src/components/Ellipsis/index.less

@@ -9,7 +9,7 @@
   position: relative;
   .shadow {
     display: block;
-    position: relative;
+    position: absolute;
     color: transparent;
     opacity: 0;
     z-index: -999;