message: Misc fixes.
  Change the premine whitelist placeholder to BTG address format.
  Reduce testnet premine window to 200 blocks.
diff: @@ -199,7 +199,7 @@ public:
  };
  vPremineAddressWhitelist = {
  - "3CjLoKt9KYcfjf4MWAbGz8xnpfJvzvMxMi",
  + "ASpCXHFL6nxSTTZuwib1iPrx9jwuia5HLQ",
  };
  }
  };
  @@ -217,7 +217,7 @@ public:
  consensus.BIP65Height = 581885; // 00000000007f6655f22f98e72ed80d8b06dc761d5da09df0fa1dc4be4f861eb6
  consensus.BIP66Height = 330776; // 000000002104c8c45e99a8853285a3b592602a3ccde2b832481da85e9e4ba182
  consensus.BTGHeight = 1210320;
  - consensus.BTGPremineWindow = 16000;
  + consensus.BTGPremineWindow = 200;
  consensus.powLimit = uint256S("07ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
  consensus.powLimitLegacy = uint256S("00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
  consensus.nPowAveragingWindow = 17;
  