fix: do not override nodeName, if exists

If nodeName was already provided in helperPod.yaml, avoid overriding it.
Fixes #498

provisioner.go

@@ -664,7 +664,7 @@ func (p *LocalPathProvisioner) createHelperPod(action ActionType, cmd []string,
 		helperPod.Name = helperPod.Name[:HelperPodNameMaxLength]
 	}
 	helperPod.Namespace = p.namespace
-	if o.Node != "" {
+	if helperPod.Spec.NodeName == "" && o.Node != "" {
 		helperPod.Spec.NodeName = o.Node
 	}
 	helperPod.Spec.ServiceAccountName = p.serviceAccountName