Fix key and deleteKey being ignored when creating a snapshot with external=true set (#33686)

* Update dashboard_snapshot.go

This is to address: https://github.com/grafana/grafana/issues/33665

The key and deleteKey fields are not honoured when creating a snapshot with external:true set

* removed whitespace

pkg/api/dashboard_snapshot.go

@@ -44,6 +44,8 @@ func createExternalDashboardSnapshot(cmd models.CreateDashboardSnapshotCommand)
 		"name":      cmd.Name,
 		"expires":   cmd.Expires,
 		"dashboard": cmd.Dashboard,
+		"key":       cmd.Key,
+		"deleteKey": cmd.DeleteKey,
 	}
 
 	messageBytes, err := simplejson.NewFromAny(message).Encode()