kube: clean up PersistentVolumeClaims

There's no difference as far as jsonnet is concerned, but it may confuse newbies, as Service and SimpleIngress use double colon for its top-level kube helpers. This also removes any ambiguity as to whether this is manifested in final JSON. So we can make that a convention.

Change-Id: I01ad4ea63f4d5d8ee6e5d41c79637ba186548c6f
Reviewed-on: https://gerrit.hackerspace.pl/c/hscloud/+/1803
Reviewed-by: q3k <q3k@hackerspace.pl>
diff --git a/personal/radex/demo-next/prod.jsonnet b/personal/radex/demo-next/prod.jsonnet
index b0308d0..5710030 100644
--- a/personal/radex/demo-next/prod.jsonnet
+++ b/personal/radex/demo-next/prod.jsonnet
@@ -44,10 +44,8 @@
     },
 
     data: top.ns.Contain(kube.PersistentVolumeClaim("data")) {
-        storage: "1Gi",
-        spec+: {
-            storageClassName: "waw-hdd-redundant-3",
-        },
+        storage:: "1Gi",
+        storageClass:: "waw-hdd-redundant-3",
     },
     service: top.ns.Contain(kube.Service(cfg.name)) {
         target:: top.deployment,