Cleaning up application categories.

Change-Id: Id3c937323123b6089cedf7b31cd01151f6aca8e1
diff --git a/apps/scalablegateway/BUCK b/apps/scalablegateway/BUCK
index 362c431..a7a6d74 100644
--- a/apps/scalablegateway/BUCK
+++ b/apps/scalablegateway/BUCK
@@ -13,7 +13,7 @@
 
 onos_app (
   title = 'Scalable Gateway',
-  category = 'Traffic Steering',
+  category = 'Traffic Engineering',
   url = 'http://onosproject.org',
   description = 'Scalable gateway service',
 )