lndc: use hex encoding method .String() method
lndc: use hex encoding method .String() method

AndrewSamokhvalov/lnd,bryanvu/lnd,LightningNetwork/lnd,ddustin/lnd,bryanvu/lnd,BitfuryLightning/lnd,LightningNetwork/lnd,aakselrod/lnd,aakselrod/lnd,ddustin/lnd,AndrewSamokhvalov/lnd,BitfuryLightning/lnd