message: wallet: upgrade the CHDChain version number when upgrading to split hd
diff: @@ -457,6 +457,13 @@ bool LegacyScriptPubKeyMan::Upgrade(int prev_version, int new_version, bilingual
  WalletLogPrintf("Upgrading wallet to use HD chain split\n");
  m_storage.SetMinVersion(FEATURE_PRE_SPLIT_KEYPOOL);
  split_upgrade = FEATURE_HD_SPLIT > prev_version;
  + // Upgrade the HDChain
  + if (m_hd_chain.nVersion < CHDChain::VERSION_HD_CHAIN_SPLIT) {
  + m_hd_chain.nVersion = CHDChain::VERSION_HD_CHAIN_SPLIT;
  + if (!WalletBatch(m_storage.GetDatabase()).WriteHDChain(m_hd_chain)) {
  + throw std::runtime_error(std::string(__func__) + ": writing chain failed");
  + }
  + }
  }
  // Mark all keys currently in the keypool as pre-split
  if (split_upgrade) {
  