fix: proxy-groups filter logic

adapter/outbound/shadowsocks.go

@@ -54,6 +54,10 @@ type v2rayObfsOption struct {
 	Mux            bool              `obfs:"mux,omitempty"`
 }
 
+func (ss *ShadowSocks) IsProxyGroup() bool {
+	return false
+}
+
 // StreamConn implements C.ProxyAdapter
 func (ss *ShadowSocks) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
 	switch ss.obfsMode {