Fix Amazon EKS option

Signed-off-by: Linh Lam <linh@kubecost.com>

packages/kubecost/cost-analyzer/overlay/questions.yaml

@@ -30,16 +30,19 @@ questions:
     subquestions:
       - variable: kubecostFrontend.image
         label: Kubecost frontend image for Amazon EKS
+        description: "Use this image for the Amazon EKS cluster: public.ecr.aws/kubecost/frontend"
         type: string
-        default: "public.ecr.aws/kubecost/frontend"
+        default: false
       - variable: kubecostModel.image
         label: Kubecost cost-model image for Amazon EKS
+        description: "Use this image for the Amazon EKS cluster: public.ecr.aws/kubecost/cost-model"
         type: string
-        default: "public.ecr.aws/kubecost/cost-model"
+        default: false
       - variable: prometheus.server.image.repository
         label: Kubecost Prometheus image for Amazon EKS
+        description: "Use this image for the Amazon EKS cluster: public.ecr.aws/kubecost/prometheus"
         type: string
-        default: "public.ecr.aws/kubecost/prometheus"
+        default: false
       - variable: prometheus.server.image.tag
         label: Kubecost Prometheus image tag for Amazon EKS
         type: string