seemingly useless line in DisconnectBlock at Validation.cpp

https://github.com/dashpay/dash/blob/7d8eab2641023c78a72ccd6efc99fc35fd030a46/src/validation.cpp#L1716

Hi
It seems this line is useless.The code is making a vector of spentIndex but does not call pblocktree->UpdateSpentIndex like it calls pblocktree->EraseAddressIndex for address index.
