message: Fix from bitcoin for duplicate inputs on block validation
diff: @@ -4137,7 +4137,7 @@ bool CheckBlock(const CBlock& block, CValidationState& state, const Consensus::P
  bool lastWasContract=false;
  // Check transactions
  for (const auto& tx : block.vtx) {
  - if (!CheckTransaction(*tx, state, false))
  + if (!CheckTransaction(*tx, state, true))
  return state.Invalid(false, state.GetRejectCode(), state.GetRejectReason(),
  strprintf("Transaction check failed (tx hash %s) %s", tx->GetHash().ToString(), state.GetDebugMessage()));
  //OP_SPEND can only exist immediately after a contract tx in a block, or after another OP_SPEND
  