discovery: properly log unit64 version of shortChanID in logs
discovery: properly log unit64 version of shortChanID in logs

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