Fix xvpvncproxy_host config path

Fix xvpvncproxy_host config path due to Change
I1e34a0f98de125c8b8b145377835d95035e2b472.

Change-Id: I835950e75509ad54e5dc1c4a740d2e5cfed9f5a9
diff --git a/lib/nova b/lib/nova
index 79bef9b..dc425a1 100644
--- a/lib/nova
+++ b/lib/nova
@@ -579,7 +579,7 @@
         iniset $NOVA_CONF vnc vncserver_listen "$VNCSERVER_LISTEN"
         iniset $NOVA_CONF vnc vncserver_proxyclient_address "$VNCSERVER_PROXYCLIENT_ADDRESS"
         iniset $NOVA_CONF DEFAULT novncproxy_host "$NOVA_SERVICE_LISTEN_ADDRESS"
-        iniset $NOVA_CONF DEFAULT xvpvncproxy_host "$NOVA_SERVICE_LISTEN_ADDRESS"
+        iniset $NOVA_CONF vnc xvpvncproxy_host "$NOVA_SERVICE_LISTEN_ADDRESS"
     else
         iniset $NOVA_CONF vnc enabled false
     fi