message: [RPC] getzerocoinsupply height not required
  In the RPC command getzerocoincoinsupply, height is assumed to be required, when it isn't.
diff: @@ -208,7 +208,7 @@ static UniValue getzerocoinsupply(const JSONRPCRequest& request)
  {
  if (request.fHelp || request.params.size() > 1)
  throw std::runtime_error(
  - "getzerocoinsupply height\n"
  + "getzerocoinsupply (height)\n"
  "\nReturns the Veil supply (in satoshis) held in zerocoins at a specified block height, or at current chain Tip.\n"
  "\nArguments:\n"
  "1. height (numeric, optional) The height index. Default is chainactive tip\n"
  