fix #2150 remove no use style

src/components/DescriptionList/Description.js

 import React from 'react';
 import PropTypes from 'prop-types';
-import classNames from 'classnames';
 import { Col } from 'antd';
 import styles from './index.less';
 import responsive from './responsive';
 
-const Description = ({ term, column, className, children, ...restProps }) => {
-  const clsString = classNames(styles.description, className);
-  return (
-    <Col className={clsString} {...responsive[column]} {...restProps}>
-      {term && <div className={styles.term}>{term}</div>}
-      {children !== null &&
-        children !== undefined && <div className={styles.detail}>{children}</div>}
-    </Col>
-  );
-};
+const Description = ({ term, column, children, ...restProps }) => (
+  <Col {...responsive[column]} {...restProps}>
+    {term && <div className={styles.term}>{term}</div>}
+    {children !== null && children !== undefined && <div className={styles.detail}>{children}</div>}
+  </Col>
+);
 
 Description.defaultProps = {
   term: '',