修复 appTheme报错

store/getters.js

@@ -2,6 +2,7 @@ const getters = {
   platform: state => state.app.platform,
   token: state => state.user.token,
   userId: state => state.user.userId,
+  appTheme: state => state.theme.appTheme,
   pageQuery: state => state.page.query
 }