Fix staging beta dashboard RSRP value mapping and color code threshold

Change-Id: I81c06abb05f719e776a49d488db5c85adcfe449f
diff --git a/monitoring/grafana-aether/dashboards/global-edge-status-staging.json b/monitoring/grafana-aether/dashboards/global-edge-status-staging.json
index d827a88..9a5b9b9 100644
--- a/monitoring/grafana-aether/dashboards/global-edge-status-staging.json
+++ b/monitoring/grafana-aether/dashboards/global-edge-status-staging.json
@@ -802,7 +802,7 @@
                   "value": "-141"
                 },
                 {
-                  "from": "-320",
+                  "from": "-341",
                   "id": 1,
                   "text": "maint",
                   "to": "-200",
@@ -818,7 +818,7 @@
                   },
                   {
                     "color": "#6ED0E0",
-                    "value": -320
+                    "value": -341
                   },
                   {
                     "color": "red",