fix(templates): fix typo in grafana dashboard.json

Fixes typo mentioned in issue #1304.
Value for "displayName" is fixed to become "Failed" instead of "Faled".

Author: lyh16

grafana/dashboards/dashboard.json

@@ -102,7 +102,7 @@
             "properties": [
               {
                 "id": "displayName",
-                "value": "Faled"
+                "value": "Failed"
               }
             ]
           },
@@ -290,4 +290,4 @@
   "title": "Watchtower",
   "uid": "d7bdoT-Gz",
   "version": 1
-}
+}