Edits title and icon of a topic in a forum supergroup chat; requires can_manage_topics administrator right in the supergroup unless the user is creator of the topic
iconCustomEmojiId Identifier of the new custom emoji for topic icon; pass 0 to remove the custom emoji. Ignored if edit_icon_custom_emoji is false. Telegram Premium users can use any custom emoji, other users can use only a custom emoji returned by getForumTopicDefaultIcons