sweep+walletrpc+lncli: report requested fee preference for pending sweeps

Previously only the fee rate used for the last sweep (the sweep bucket
average) was reported. This commit adds the request fee preference to
the report, which is used to select a bucket and the sweep tx fee rate.

lnrpc/walletrpc/walletkit_server.go

@@ -404,6 +404,9 @@ func (w *WalletKit) PendingSweeps(ctx context.Context,
 		broadcastAttempts := uint32(pendingInput.BroadcastAttempts)
 		nextBroadcastHeight := uint32(pendingInput.NextBroadcastHeight)
 
+		requestedFee := pendingInput.Params.Fee
+		requestedFeeRate := uint32(requestedFee.FeeRate.FeePerKVByte() / 1000)
+
 		rpcPendingSweeps = append(rpcPendingSweeps, &PendingSweep{
 			Outpoint:            op,
 			WitnessType:         witnessType,
@@ -411,6 +414,8 @@ func (w *WalletKit) PendingSweeps(ctx context.Context,
 			SatPerByte:          satPerByte,
 			BroadcastAttempts:   broadcastAttempts,
 			NextBroadcastHeight: nextBroadcastHeight,
+			RequestedSatPerByte: requestedFeeRate,
+			RequestedConfTarget: requestedFee.ConfTarget,
 		})
 	}