Revert: "fix: proxy-groups filter logic"

This reverts commit 8a85c63b08.

adapter/outbound/trojan.go

@@ -27,6 +27,7 @@ type Trojan struct {
 	gunConfig    *gun.Config
 	transport    *http2.Transport
 }
+
 type TrojanOption struct {
 	BasicOption
 	Name           string      `proxy:"name"`
@@ -44,10 +45,6 @@ type TrojanOption struct {
 	FlowShow       bool        `proxy:"flow-show,omitempty"`
 }
 
-func (t *Trojan) IsProxyGroup() bool {
-	return false
-}
-
 func (t *Trojan) plainStream(c net.Conn) (net.Conn, error) {
 	if t.option.Network == "ws" {
 		host, port, _ := net.SplitHostPort(t.addr)