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/ops/monitoring/lib/cluster.libsonnet b/ops/monitoring/lib/cluster.libsonnet
index 6191399..f7508ce 100644
--- a/ops/monitoring/lib/cluster.libsonnet
+++ b/ops/monitoring/lib/cluster.libsonnet
@@ -259,8 +259,8 @@
                 metadata+: {
                     namespace: cfg.namespace,
                 },
-                storage: "16Gi",
-                storageClass: cfg.storageClasses.prometheus,
+                storage:: "16Gi",
+                storageClass:: cfg.storageClasses.prometheus,
             },
 
             // Network Policy governing access to the prometheus server.