deleteReactionForUser method
Deletes all reactions for a given emoji on a message.
Implementation
Future<void> deleteReactionForUser(Snowflake id, Snowflake userId, ReactionBuilder emoji) async {
final route = HttpRoute()
..channels(id: channelId.toString())
..messages(id: id.toString())
..reactions(emoji: emoji.build(), userId: userId.toString());
final request = BasicRequest(route, method: 'DELETE');
await client.httpHandler.executeSafe(request);
}