routing: distinguish between receiver amount and total amount in newRoute

routing/router.go

@@ -1456,6 +1456,7 @@ func (r *ChannelRouter) FindRoute(source, target route.Vertex,
 		source, path, uint32(currentHeight),
 		finalHopParams{
 			amt:       amt,
+			totalAmt:  amt,
 			cltvDelta: finalExpiry,
 			records:   destCustomRecords,
 		},
@@ -2513,6 +2514,7 @@ func (r *ChannelRouter) BuildRoute(amt *lnwire.MilliSatoshi,
 		source, pathEdges, uint32(height),
 		finalHopParams{
 			amt:       receiverAmt,
+			totalAmt:  receiverAmt,
 			cltvDelta: uint16(finalCltvDelta),
 			records:   nil,
 		},