lnwallet: update interface test initiation for latest API change
lnwallet: update interface test initiation for latest API change

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