Remove duplicate code

Author: Tom Kirkpatrick

lib/middleware/user-context.js

@@ -25,14 +25,9 @@ module.exports = function userContextMiddleware() {
     const UserModel = app.accessUtils.options.userModel || 'User';
     const GroupAccessModel = app.accessUtils.options.groupAccessModel || 'GroupAccess';
 
-
     return Promise.join(
       app.models[UserModel].findById(req.accessToken.userId),
-      app.models[GroupAccessModel].find({
-        where: {
-          userId: req.accessToken.userId
-        }
-      }),
+      app.accessUtils.getUserGroups(req.accessToken.userId),
       (user, groups) => {
         if (!user) {
           return next(new Error('No user with this access token was found.'));