Fix Kubernetes Manifest for Web UI

There are currently 2 issues with the Kubernetes manifest:

- open-webui-deployment refers to ollama-webui-pvc but not included in
  kustomization.yaml, causing issue if using GPU deployment
- ollama-webui-pvc is using the wrong namespace

This commit fixes both issue.

kubernetes/manifest/kustomization.yaml

@@ -5,6 +5,7 @@ resources:
 - base/webui-deployment.yaml
 - base/webui-service.yaml
 - base/webui-ingress.yaml
+- base/webui-pvc.yaml
 
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization