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/app/inventory/prod.jsonnet b/app/inventory/prod.jsonnet
index eb08009..5648692 100644
--- a/app/inventory/prod.jsonnet
+++ b/app/inventory/prod.jsonnet
@@ -65,8 +65,8 @@
   },
 
   media: top.ns.Contain(kube.PersistentVolumeClaim(cfg.name)) {
-    storage: '20Gi',
-    storageClass: cfg.storageClassName,
+    storage:: '20Gi',
+    storageClass:: cfg.storageClassName,
   },
 
   psql: postgres {