[Blazor] On development show detailed circuit error information.

RomRepoMgr.Blazor/appsettings.Development.json

@@ -4,5 +4,8 @@
       "Default":              "Information",
       "Microsoft.AspNetCore": "Warning"
     }
+  },
+  "CircuitOptions": {
+    "DetailedErrors": true
   }
 }