lnwallet: update TestRevocationKeyDerivation to use new derivation
lnwallet: update TestRevocationKeyDerivation to use new derivation

LightningNetwork/lnd,aakselrod/lnd,ddustin/lnd,ddustin/lnd,aakselrod/lnd,AndrewSamokhvalov/lnd,AndrewSamokhvalov/lnd,LightningNetwork/lnd