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/matrix/lib/matrix.libsonnet b/app/matrix/lib/matrix.libsonnet
index c72b060..29cdaf5 100644
--- a/app/matrix/lib/matrix.libsonnet
+++ b/app/matrix/lib/matrix.libsonnet
@@ -97,8 +97,8 @@
 
     dataVolume: kube.PersistentVolumeClaim("synapse-data-waw3") {
         metadata+: app.metadata("synapse-data"),
-        storage: "50Gi",
-        storageClass: cfg.storageClassName,
+        storage:: "50Gi",
+        storageClass:: cfg.storageClassName,
     },
 
     // homeserver.yaml that will be used to run synapse (in synapseConfigMap).