WLM panels not working in default dashboard

[vgkowski]

The WLM panels are not working in the default dashboard. The $service_class variable is passed to Grafana without quotes resulting in a query error (when evaluating this part:
service_class = split_part(103: Default queue, ':', 1) AND

redshift-datasource/src/dashboards/redshift-monitoring.json

Line 2597 in ab23ec9

"rawSQL": "-- grafana-redshift-default-dashboard\nSELECT\n $__timeGroup(queue_end_time, $__interval),\n percentile_cont(1) WITHIN GROUP (ORDER BY total_queue_time) AS p100,\n percentile_cont(0.75) WITHIN GROUP (ORDER BY total_queue_time) AS p75,\n percentile_cont(0.50) WITHIN GROUP (ORDER BY total_queue_time) AS p50\nFROM stl_wlm_query\nWHERE\n service_class = split_part($service_class, ':', 1) AND\n $__timeFilter(queue_end_time)\nGROUP BY 1\nORDER BY 1",