APM-6136 use correct var for prod org smoketests

Author: sophieclayton12-nhs

azure/templates/e2e.yml

@@ -27,7 +27,7 @@ steps:
         export APIGEE_ACCESS_TOKEN="$(secret.AccessToken)"
         export APIGEE_ORGANIZATION="nhsd-$(APIGEE_ORGANIZATION)"
         export APIGEE_APP_ID=${{ parameters.app_id }}
-        export STATUS_ENDPOINT_API_KEY="$(STATUS_ENDPOINT_API_KEY)"
+        export STATUS_ENDPOINT_API_KEY="$(status-endpoint-api-key)"
         make -C e2e ${{ parameters.test_type }}
 
       workingDirectory: $(SERVICE_DIR)