Revert: "fix: proxy-groups filter logic"

This reverts commit 8a85c63b08.

adapter/outbound/http.go

@@ -38,10 +38,6 @@ type HttpOption struct {
 	Headers        map[string]string `proxy:"headers,omitempty"`
 }
 
-func (h *Http) IsProxyGroup() bool {
-	return false
-}
-
 // StreamConn implements C.ProxyAdapter
 func (h *Http) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
 	if h.tlsConfig != nil {