Fix a LiveView graph

Author: joshk

priv/grafana/phoenix_live_view.json.eex

@@ -300,7 +300,7 @@
           "calcs": [
             "lastNotNull"
           ],
-          "fields": "/^Value$/",
+          "fields": "",
           "values": false
         },
         "textMode": "auto"
@@ -544,7 +544,7 @@
           "calcs": [
             "lastNotNull"
           ],
-          "fields": "/^Value$/",
+          "fields": "",
           "values": false
         },
         "textMode": "auto"