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/hswaw/kube/pretalx.libsonnet b/hswaw/kube/pretalx.libsonnet
index d28aa59..1e340b0 100644
--- a/hswaw/kube/pretalx.libsonnet
+++ b/hswaw/kube/pretalx.libsonnet
@@ -231,8 +231,8 @@
 
         volumeData: kube.PersistentVolumeClaim(pretalx.makeName("-data")) {
             metadata+: pretalx.metadata,
-            storage: "5Gi",
-            storageClass: cfg.storageClassName,
+            storage:: "5Gi",
+            storageClass:: cfg.storageClassName,
         },
 
         s3: kube.CephObjectStoreUser(pretalx.makeNameGlobal("-s3")) {