Fixed app category for live-compile YANG models.

Change-Id: I599f252253d54b0d2a871c5485da347419c6e0a0
diff --git a/apps/yang/src/main/resources/app.xml b/apps/yang/src/main/resources/app.xml
index 1188a02..96473c1 100644
--- a/apps/yang/src/main/resources/app.xml
+++ b/apps/yang/src/main/resources/app.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <app name="MODEL_ID" origin="ONOS Community" version="1.0"
-     title="YANG Model: MODEL_ID" category="Model" url="http://onosproject.org"
+     title="YANG Model: MODEL_ID" category="Models" url="http://onosproject.org"
      featuresRepo="mvn:org.onosproject/MODEL_ID/1.0/xml/features"
      features="MODEL_ID" apps="org.onosproject.yang">
     <description>YANG Model: MODEL_ID</description>