fix: implement filename strategy in userbot listen mode

pkg/tfile/tgfile.go

@@ -14,6 +14,7 @@ type TGFile interface {
 	Dler() downloader.Client // witch client to use for downloading
 	Size() int64
 	Name() string
+	SetName(name string)
 }
 
 type TGFileMessage interface {
@@ -29,6 +30,10 @@ type tgFile struct {
 	dler     downloader.Client
 }
 
+func (f *tgFile) SetName(name string) {
+	f.name = name
+}
+
 func (f *tgFile) Location() tg.InputFileLocationClass {
 	return f.location
 }