use EXUI preview image for retaining hidden fields

Author: AlistairEdwinOsborne

charts/fpl-case-service/values.preview.template.yaml

@@ -57,7 +57,7 @@ xui-webapp:
     imagePullPolicy: Always
     replicas: 1
     releaseNameOverride: ${SERVICE_NAME}-xui-webapp
-    image: hmctspublic.azurecr.io/xui/webapp:latest
+    image: hmctspublic.azurecr.io/xui/webapp:pr-4944-601ed2c-20260213174647
     ingressHost: xui-${SERVICE_FQDN}
     devcpuRequests: 500m
     devmemoryRequests: 1Gi