message: fix(statics): remove invalid wif constants
  These coins in fact use the same values as the bitcoin testnet.
  Dash:
  Litecoin:
  BREAKING CHANGE:
  While this is a breaking change, I don't think these values were
  actually used anywhere.
  Issue:
diff: @@ -164,7 +164,6 @@ class DashTestnet extends BitcoinLikeTestnet {
  messagePrefix = '\x19DarkCoin Signed Message:\n';
  pubKeyHash = 0x8c;
  scriptHash = 0x13;
  - wif = 0xef;
  family = CoinFamily.DASH;
  explorerUrl = 'https://tbch.blockdozer.com/tx/';
  }
  @@ -206,7 +205,6 @@ class LitecoinTestnet extends BitcoinLikeTestnet {
  bech32 = 'tltc';
  pubKeyHash = 0x6f;
  scriptHash = 0x3a;
  - wif = 0xb0;
  family = CoinFamily.LTC;
  explorerUrl = 'http://explorer.litecointools.com/tx/';
  }
  