chore(theme-default): tweak import and export order

Author: meteorlxy

packages/@vuepress/theme-default/src/composables/index.ts

@@ -1,5 +1,5 @@
 export * from './useNavLink'
 export * from './useResolveRouteWithRedirect'
-export * from './useSidebarItems'
 export * from './useScrollPromise'
+export * from './useSidebarItems'
 export * from './useThemeData'

packages/@vuepress/theme-default/src/layouts/Layout.vue

@@ -62,8 +62,8 @@ import Page from '../components/Page.vue'
 import Navbar from '../components/Navbar.vue'
 import Sidebar from '../components/Sidebar.vue'
 import {
-  useSidebarItems,
   useScrollPromise,
+  useSidebarItems,
   useThemeLocaleData,
 } from '../composables'