lnwallet: update DeleteState method to latest DB API change
lnwallet: update DeleteState method to latest DB API change

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