Rename middleware fn name

lib/cartodb/controllers/map.js

@@ -329,7 +329,7 @@ function getTilejson(tiles, grids) {
 }
 
 MapController.prototype.setTilejsonMetadataToLayergroup = function () {
-    return function augmentLayergroupDataMiddleware (req, res, next) {
+    return function augmentLayergroupTilejsonMiddleware (req, res, next) {
         const { layergroup, user, mapconfig } = res.locals;
 
         const isVectorOnlyMapConfig = mapconfig.isVectorOnlyMapConfig();