fix: display scrollBar (#410)

* fix: dispaly scrollBar

* update snapshots

Author: shaodahong

assets/index.less

@@ -1,6 +1,6 @@
 @tablePrefixCls: rc-table;
-@text-color : #666;
-@font-size-base : 12px;
+@text-color: #666;
+@font-size-base: 12px;
 @line-height: 1.5;
 @table-border-color: #e9e9e9;
 @table-head-background-color: #f7f7f7;

src/Table.tsx

@@ -532,8 +532,7 @@ function Table<RecordType extends DefaultRecordType>(props: TableProps<RecordTyp
         {showHeader !== false && (
           <div
             style={{
-              ...scrollXStyle,
-              marginBottom: fixColumn ? -scrollbarSize : null,
+              overflow: 'hidden',
             }}
             onScroll={onScroll}
             ref={scrollHeaderRef}

tests/__snapshots__/FixedColumn.spec.js.snap

@@ -796,7 +796,7 @@ exports[`Table.FixedColumn renders correctly scrollXY - with data 1`] = `
   >
     <div
       class="rc-table-header"
-      style="overflow-x: scroll; margin-bottom: -15px;"
+      style="overflow: hidden;"
     >
       <table
         style="table-layout: fixed;"

tests/__snapshots__/Table.spec.js.snap

@@ -75,7 +75,7 @@ exports[`Table.Basic custom components renders fixed column and header correctly
   >
     <div
       class="rc-table-header"
-      style="overflow-x: scroll; margin-bottom: -15px;"
+      style="overflow: hidden;"
     >
       <table
         style="table-layout: fixed; visibility: hidden;"
@@ -196,7 +196,7 @@ exports[`Table.Basic custom components scroll content with scroll 1`] = `
   >
     <div
       class="rc-table-header"
-      style="overflow-x: scroll; margin-bottom: -15px;"
+      style="overflow: hidden;"
     >
       <table
         style="table-layout: fixed;"