Missing `ss58Format` field in `system_properties` for Westend Asset Hub

[moronyoh]

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Description of bug

Hello !
I'm working at Ledger and we are using polkadot-parachain-node (in version 2503-7) to deploy both westend relay chain & asset hub. It works fine but one of the tool we connected to our nodes call the RPC method: system_properties and it doesn't have the same output for westend asset hub, it miss the ss58Format field. This field is well defined for westend relay chain & aslo polkadot asset hub & relay chain.

Steps to reproduce

I also reproduced in public nodes:

$ curl -s -H 'Content-Type: application/json' -d '{"id":"test","method":"system_properties", "jsonrpc":"2.0"}' https://westend-asset-hub-rpc.polkadot.io | jq .
{
  "jsonrpc": "2.0",
  "id": "test",
  "result": {
    "tokenDecimals": 12,
    "tokenSymbol": "WND"
  }
}
$ curl -s -H 'Content-Type: application/json' -d '{"id":"test","method":"system_properties", "jsonrpc":"2.0"}' https://westend-rpc.polkadot.io | jq .
{
  "jsonrpc": "2.0",
  "id": "test",
  "result": {
    "ss58Format": 42,
    "tokenDecimals": 12,
    "tokenSymbol": "WND"
  }
}