fix empty rows in slurm jobs dashboard ...

slurm-stats datasource was not getting the "database" (=index) set, hence
in opensearch which adds additional 'security-auditlog*' indices not present
in opendistro, the dashboard query was returning non-slurm-stats documents
without the fields expected => empty rows

Author: sjpb

environments/common/inventory/group_vars/all/grafana.yml

@@ -72,7 +72,7 @@ grafana_datasources:
     jsonData:
       tlsSkipVerify: true
       timeField: "@timestamp"
-    database: "filebeat-*"
+      database: filebeat-*
     readOnly: false
     editable: true