Switching format to match validation

Author: marcleblanc2

base/frontend/sourcegraph-frontend.Deployment.yaml

@@ -105,7 +105,7 @@ spec:
         - name: OTEL_EXPORTER_OTLP_ENDPOINT
           value: http://$(OTEL_AGENT_HOST):4317
         - name: DEPLOY_TYPE
-          value: "LegacyKustomize"
+          value: "legacy-kustomize"
         terminationMessagePolicy: FallbackToLogsOnError
         livenessProbe:
           httpGet: