portal: add missing fi.mau.gif field to gifvs

Author: tulir

portal_convert.go

@@ -252,6 +252,7 @@ func (portal *Portal) convertDiscordVideoEmbed(ctx context.Context, intent *apps
 	if content.MsgType == event.MsgVideo && embed.Type == discordgo.EmbedTypeGifv {
 		extra["info"] = map[string]any{
 			"fi.mau.discord.gifv":  true,
+			"fi.mau.gif":           true,
 			"fi.mau.loop":          true,
 			"fi.mau.autoplay":      true,
 			"fi.mau.hide_controls": true,