bng.stats passed by default as topic to kpi exporter

Change-Id: I23125b595f80b411f4b1b72785c5dfe0c6864442
diff --git a/nem-monitoring/grafana-dashboards/bng-dashboard.json b/nem-monitoring/grafana-dashboards/bng-dashboard.json
index d90aa93..6286e27 100644
--- a/nem-monitoring/grafana-dashboards/bng-dashboard.json
+++ b/nem-monitoring/grafana-dashboards/bng-dashboard.json
@@ -480,7 +480,9 @@
   "refresh": "15s",
   "schemaVersion": 16,
   "style": "dark",
-  "tags": [],
+  "tags": [
+    "seba"
+  ],
   "templating": {
     "list": [
       {