Use correct Serialization Type in `CBlockHeader::GetHash()` (#4068)
Use correct Serialization Type in `CBlockHeader::GetHash()` (#4068)

Nothing critical but it would be nice to use the right one.
dashpay/dash,thelazier/dash,thelazier/dash,UdjinM6/dash,dashpay/dash,dashpay/dash,UdjinM6/dash,thelazier/dash,UdjinM6/dash,thelazier/dash,dashpay/dash,dashpay/dash,UdjinM6/dash,thelazier/dash,UdjinM6/dash