lnwire: remove the CreditsAmount definition, will be replaced with MilliSat
lnwire: remove the CreditsAmount definition, will be replaced with MilliSat

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