Fix hysteria2 mbps calculation

inbound/hysteria2.go

@@ -14,6 +14,7 @@ import (
 	C "github.com/sagernet/sing-box/constant"
 	"github.com/sagernet/sing-box/log"
 	"github.com/sagernet/sing-box/option"
+	"github.com/sagernet/sing-box/transport/hysteria"
 	"github.com/sagernet/sing-quic/hysteria2"
 	"github.com/sagernet/sing/common"
 	"github.com/sagernet/sing/common/auth"
@@ -88,8 +89,8 @@ func NewHysteria2(ctx context.Context, router adapter.Router, logger log.Context
 	service, err := hysteria2.NewService[int](hysteria2.ServiceOptions{
 		Context:               ctx,
 		Logger:                logger,
-		SendBPS:               uint64(options.UpMbps * 1024 * 1024),
-		ReceiveBPS:            uint64(options.DownMbps * 1024 * 1024),
+		SendBPS:               uint64(options.UpMbps * hysteria.MbpsToBps),
+		ReceiveBPS:            uint64(options.DownMbps * hysteria.MbpsToBps),
 		SalamanderPassword:    salamanderPassword,
 		TLSConfig:             tlsConfig,
 		IgnoreClientBandwidth: options.IgnoreClientBandwidth,