fix: table resize handle line color, close #4813 #

Author: tangjinzhou

components/table/style/resize.less

@@ -12,7 +12,7 @@
   z-index: 1;
   &-line {
     display: block;
-    width: 3px;
+    width: 1px;
     margin-left: 7px;
     height: 100% !important;
     background-color: @primary-color;