Fix cmd/main.go path in run-with-webhooks

The file was moved (or recreated) as part of openstack-k8s-operators#788
and the path in hack/run_with_local_wehbook.sh wasn't adjusted
correctly.

Author: vyzigold

hack/run_with_local_webhook.sh

@@ -303,4 +303,4 @@ else
     oc scale --replicas=0 -n openstack-operators deploy/telemetry-operator-controller-manager
 fi
 
-go run ./cmdmain.go -metrics-bind-address ":${METRICS_PORT}" -health-probe-bind-address ":${HEALTH_PORT}" -pprof-bind-address ":${PPROF_PORT}" -webhook-bind-address "${WEBHOOK_PORT}"
+go run ./cmd/main.go -metrics-bind-address ":${METRICS_PORT}" -health-probe-bind-address ":${HEALTH_PORT}" -pprof-bind-address ":${PPROF_PORT}" -webhook-bind-address "${WEBHOOK_PORT}"