message: trivial: downgrade "system counter missing" error log to warning
  Closes:
diff: @@ -42,7 +42,7 @@ impl SystemStore {
  if let Some(counters) = self.db.get::<LedgerCountersSchema>(&base_version)? {
  counters
  } else {
  - error!(
  + warn!(
  "Base version ({}) ledger counters not found. Assuming zeros.",
  base_version
  );
  