Fix for the proper json

This fixes the json file, which currently prevents all
grafana dashboards to be imported.

Change-Id: I2fef5f7117121744d30ef6db34e6ed59a0b42afc
Closes-Bug: PROD-18290
diff --git a/nova/files/grafana_dashboards/nova_prometheus_fluentd.json b/nova/files/grafana_dashboards/nova_prometheus_fluentd.json
index 411cbc8..6eaf31d 100644
--- a/nova/files/grafana_dashboards/nova_prometheus_fluentd.json
+++ b/nova/files/grafana_dashboards/nova_prometheus_fluentd.json
@@ -2499,7 +2499,7 @@
               "show": true
             }
           ]
-        },
+        }
       ],
       "repeat": null,
       "repeatIteration": null,