message: Add height as arg for getsubsidy
diff: @@ -220,7 +220,9 @@ static UniValue getsubsidy(const JSONRPCRequest& request)
  {
  RPCHelpMan{"getsubsidy",
  "\nReturns subsidy value for the specified value of target.",
  - {},
  + {
  + {"height", RPCArg::Type::NUM, RPCArg::Optional::OMITTED_NAMED_ARG, "Specify block height."},
  + },
  RPCResult{
  "subsidy (numeric) Subsidy value for the specified target\n"
  },
  