fix: icon show error

Author: bndynet

src/pages/admin/Admin.tsx

@@ -9,7 +9,6 @@ import {
 
 import { themeConfig, isClassic, AppTheme } from 'app/theme';
 import { adminRoutes } from 'app/config';
-
 import { Frame } from './core';
 
 const styles = (theme: AppTheme) =>

src/pages/admin/core/Header.tsx

@@ -168,7 +168,7 @@ class Header extends React.PureComponent<HeaderProps, HeaderState> {
                 >
                     <i
                         className={classNames(
-                            'fas fa-bars animated',
+                            'fa fa-bars animated',
                             hideBrand && 'rotateIn',
                         )}
                     />