fix: 消息提醒他弹框新增收缩按钮

src/components/MessageReminder/Simple/index.jsx

 import React, { useState, useEffect } from 'react';
 import { Badge, notification, Spin } from 'antd';
-import { CloseOutlined } from '@ant-design/icons';
+import { CloseOutlined, DoubleLeftOutlined, DoubleRightOutlined } from '@ant-design/icons';
 import classNames from 'classnames';
 import { useHistory } from 'react-router-dom';
 // import copy from 'copy-to-clipboard';
@@ -19,7 +19,7 @@ const Horn = props => {
       onClick={toggle}
     >
       <span className={styles['horn--btn']} onClick={e => onStow(e)}>
-        {stowClass ? '<' : '>'}
+        {stowClass ? <DoubleLeftOutlined /> : <DoubleRightOutlined />}
       </span>
       <Badge count={count}>
         <div className={styles['horn--num']}>消息提醒</div>