Fix download calico policy condition (#6474)

roles/download/defaults/main.yml

@@ -783,7 +783,7 @@ downloads:
     - k8s-cluster
 
   calico_policy:
-    enabled: "{{ enable_network_policy or kube_network_plugin == 'canal' }}"
+    enabled: "{{ enable_network_policy and kube_network_plugin in ['calico', 'canal'] }}"
     container: true
     repo: "{{ calico_policy_image_repo }}"
     tag: "{{ calico_policy_image_tag }}"