multi: add new method FeePerVByte to avoid manual conversion

lnrpc/walletrpc/walletkit_server.go

@@ -782,12 +782,12 @@ func (w *WalletKit) PendingSweeps(ctx context.Context,
 
 		op := lnrpc.MarshalOutPoint(&pendingInput.OutPoint)
 		amountSat := uint32(pendingInput.Amount)
-		satPerVbyte := uint64(pendingInput.LastFeeRate.FeePerKVByte() / 1000)
+		satPerVbyte := uint64(pendingInput.LastFeeRate.FeePerVByte())
 		broadcastAttempts := uint32(pendingInput.BroadcastAttempts)
 		nextBroadcastHeight := uint32(pendingInput.NextBroadcastHeight)
 
 		requestedFee := pendingInput.Params.Fee
-		requestedFeeRate := uint64(requestedFee.FeeRate.FeePerKVByte() / 1000)
+		requestedFeeRate := uint64(requestedFee.FeeRate.FeePerVByte())
 
 		rpcPendingSweeps = append(rpcPendingSweeps, &PendingSweep{
 			Outpoint:             op,

lnrpc/wtclientrpc/wtclient.go

@@ -476,15 +476,11 @@ func (c *WatchtowerClient) Policy(ctx context.Context,
 	}
 
 	return &PolicyResponse{
-		MaxUpdates: uint32(policy.MaxUpdates),
-		SweepSatPerVbyte: uint32(
-			policy.SweepFeeRate.FeePerKVByte() / 1000,
-		),
+		MaxUpdates:       uint32(policy.MaxUpdates),
+		SweepSatPerVbyte: uint32(policy.SweepFeeRate.FeePerVByte()),
 
 		// Deprecated field.
-		SweepSatPerByte: uint32(
-			policy.SweepFeeRate.FeePerKVByte() / 1000,
-		),
+		SweepSatPerByte: uint32(policy.SweepFeeRate.FeePerVByte()),
 	}, nil
 }
 
@@ -519,7 +515,7 @@ func marshallTower(tower *wtclient.RegisteredTower, policyType PolicyType,
 
 		rpcSessions = make([]*TowerSession, 0, len(tower.Sessions))
 		for _, session := range sessions {
-			satPerVByte := session.Policy.SweepFeeRate.FeePerKVByte() / 1000
+			satPerVByte := session.Policy.SweepFeeRate.FeePerVByte()
 			rpcSessions = append(rpcSessions, &TowerSession{
 				NumBackups:        uint32(ackCounts[session.ID]),
 				NumPendingBackups: uint32(pendingCounts[session.ID]),