message: rpc: don't require wallet for enumeratesigners
diff: @@ -32,9 +32,6 @@ static RPCHelpMan enumeratesigners()
  },
  RPCExamples{""},
  [](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue {
  - std::shared_ptr<CWallet> const wallet = GetWalletForJSONRPCRequest(request);
  - if (!wallet) return NullUniValue;
  -
  const std::string command = gArgs.GetArg("-signer", "");
  if (command == "") throw JSONRPCError(RPC_WALLET_ERROR, "Error: restart bitcoind with -signer=<cmd>");
  std::string chain = gArgs.GetChainName();
  