fix: set persistence enable to true by default (#29)

## Summary by Sourcery

Enhancements:
- Enable persistent volume claims by default for network-nodes

Author: insider89

charts/network/charts/network-nodes/values.yaml

@@ -483,7 +483,7 @@ readinessProbe:
 # Persistent storage configuration for both validator and RPC StatefulSets.
 persistence:
   # -- (bool) Enable persistent volume claims for ledger data.
-  enabled: false
+  enabled: true
   # -- (string) Container path where the persistent volume is mounted.
   mountPath: /data
   # -- (string) Logical name for the volume when using volumeClaimTemplates.