styles: 修复 CRUD 列元素嵌套表格时, affixOffsetTop计算错误问题

packages/amis/src/renderers/Table/index.tsx

@@ -2193,7 +2193,9 @@ export default class Table extends React.Component<TableProps, object> {
         store.firstToggledColumnIndex === props.colIndex,
       onQuery: undefined,
       style,
-      className: cx(column.pristine.className, stickyClassName)
+      className: cx(column.pristine.className, stickyClassName),
+      /** 给子节点的设置默认值，避免取到env.affixHeader的默认值，导致表头覆盖首行 */
+      affixOffsetTop: 0
     };
     delete subProps.label;