Rename AuthAppi by AuthBackend

lib/cartodb/api/map/preview-template-controller.js

@@ -29,7 +29,7 @@ function PreviewTemplateController (
     tablesExtentApi,
     metadataBackend,
     pgConnection,
-    authApi,
+    authBackend,
     userLimitsApi
 ) {
     this.namedMapProviderCache = namedMapProviderCache;
@@ -38,7 +38,7 @@ function PreviewTemplateController (
     this.tablesExtentApi = tablesExtentApi;
     this.metadataBackend = metadataBackend;
     this.pgConnection = pgConnection;
-    this.authApi = authApi;
+    this.authBackend = authBackend;
     this.userLimitsApi = userLimitsApi;
 }
 
@@ -48,7 +48,7 @@ PreviewTemplateController.prototype.register = function (mapRouter) {
     mapRouter.get(
         `/static/named/:template_id/:width/:height.:format`,
         credentials(),
-        authorize(this.authApi),
+        authorize(this.authBackend),
         dbConnSetup(this.pgConnection),
         rateLimit(this.userLimitsApi, RATE_LIMIT_ENDPOINTS_GROUPS.STATIC_NAMED),
         cleanUpQueryParams(['layer', 'zoom', 'lon', 'lat', 'bbox']),