Fix tun GSO check

protocol/openconnect/endpoint.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"net"
 	"net/netip"
-	"slices"
 	"strings"
 
 	"github.com/sagernet/sing-box/adapter"
@@ -33,10 +32,6 @@ type endpointBase struct {
 	logger log.ContextLogger
 }
 
-func (e *endpointBase) SupportsFlow(network string) bool {
-	return slices.Contains(e.Network(), network)
-}
-
 func (e *endpointBase) newConnection(ctx context.Context, endpoint adapter.Endpoint, localAddresses []netip.Prefix, conn net.Conn, source M.Socksaddr, destination M.Socksaddr, onClose N.CloseHandlerFunc) {
 	var metadata adapter.InboundContext
 	metadata.Inbound = endpoint.Tag()