lnwallet: update ReceiveRevocation to use new DB API's
lnwallet: update ReceiveRevocation to use new DB API's

We no longer need to manually pass in the channel delta to
AppendToRevocationLog (now called AdvanceCommitChainTail) as the
pointers on-disk will be updated atomically.

aakselrod/lnd,LightningNetwork/lnd,aakselrod/lnd,LightningNetwork/lnd