fix: target for image override in Istio k8s env

Signed-off-by: Shane Utt <[email protected]>

Author: shaneutt

deploy/environments/dev/kubernetes-istio/kustomization.yaml

@@ -12,7 +12,7 @@ images:
 - name: quay.io/llm-d/vllm-sim
   newName: ${VLLM_SIM_IMAGE}
   newTag: ${VLLM_SIM_TAG}
-- name: quay.io/llm-d/llm-d-gateway-api-inference-extension
+- name: quay.io/llm-d/gateway-api-inference-extension/epp
   newName: ${EPP_IMAGE}
   newTag: ${EPP_TAG}