Remove legacy hack

lib/cartodb/middleware/prepare-context.js

@@ -27,11 +27,12 @@ var REQUEST_QUERY_PARAMS_WHITELIST = [
 module.exports = function prepareContextMiddleware (authApi, pgConnection) {
     return function prepareContext (req, res, next) {
         var allowedQueryParams = REQUEST_QUERY_PARAMS_WHITELIST;
+
         if (Array.isArray(req.context.allowedQueryParams)) {
             allowedQueryParams = allowedQueryParams.concat(req.context.allowedQueryParams);
         }
+
         req.query = _.pick(req.query, allowedQueryParams);
-        req.params = _.extend({}, req.params); // shuffle things as request is a strange array/object
 
         var user = req.context.user;
 

test/unit/cartodb/prepare-context.test.js

@@ -39,6 +39,7 @@ describe('prepare-context', function() {
             done: function() {}
         };
         req.context = { user: 'localhost' };
+        req.params = {};
         return req;
     }