Cleaning up application categories.

Change-Id: Id3c937323123b6089cedf7b31cd01151f6aca8e1
diff --git a/apps/proxyarp/BUCK b/apps/proxyarp/BUCK
index fe57fcb..6923d0d 100644
--- a/apps/proxyarp/BUCK
+++ b/apps/proxyarp/BUCK
@@ -9,7 +9,7 @@
 
 onos_app (
     title = 'Proxy ARP/NDP',
-    category = 'Traffic Steering',
+    category = 'Traffic Engineering',
     url = 'http://onosproject.org',
     description = 'Proxy ARP/NDP application.',
 )