Fix a bug reloading the blockchain
Fix a bug reloading the blockchain

A bug in the restoration of stake nodes from the disk would prevent the
blockchain from reloading if there was an immediate reorganization
required on start up.  This correctly disconnects the block.

jcmincke/dcrd,jcmincke/dcrd,jrick/dcrd,jcmincke/dcrd,jrick/dcrd,decred/dcrd,jrick/btcd,decred/dcrd,jrick/btcd,jrick/btcd