chore(monitoring): Fix display of used % in storage dashboard

infrastructure/monitoring/dashboards/kubernetes-persistent-volumes-cluster.json

@@ -579,6 +579,10 @@
               {
                 "id": "decimals",
                 "value": 1
+              },
+              {
+                "id": "max",
+                "value": 100
               }
             ]
           },