新增菜单导航显示风格TopNav（false为左侧导航菜单，true为顶部导航菜单）

ruoyi-ui/src/store/modules/settings.js

@@ -1,12 +1,13 @@
 import variables from '@/assets/styles/element-variables.scss'
 import defaultSettings from '@/settings'
 
-const { sideTheme, showSettings, tagsView, fixedHeader, sidebarLogo } = defaultSettings
+const { sideTheme, showSettings, topNav, tagsView, fixedHeader, sidebarLogo } = defaultSettings
 
 const state = {
   theme: variables.theme,
   sideTheme: sideTheme,
   showSettings: showSettings,
+  topNav: topNav,
   tagsView: tagsView,
   fixedHeader: fixedHeader,
   sidebarLogo: sidebarLogo