message: Fix create coin stake subsidy calculation
diff: @@ -3532,7 +3532,7 @@ bool CWallet::CreateCoinStake(const CKeyStore& keystore, unsigned int nBits, con
  int64_t nRewardPiece = 0;
  // Calculate reward
  {
  - int64_t nReward = nTotalFees + GetBlockSubsidy(pindexPrev->nHeight, consensusParams);
  + int64_t nReward = nTotalFees + GetBlockSubsidy(pindexPrev->nHeight + 1, consensusParams);
  if (nReward < 0)
  return false;
  