message: Add missing guild for webhook events.
diff: @@ -209,13 +209,14 @@ export class DiscordBot {
  msg = [msg];
  }
  msg.forEach((m: Discord.Message) => {
  - log.verbose("DiscordBot", "Sent ", msg);
  + log.verbose("DiscordBot", "Sent ", m);
  this.sentMessages.push(m.id);
  const evt = new DbEvent();
  evt.MatrixId = event.event_id;
  evt.DiscordId = m.id;
  - evt.GuildId = m.guild.id;
  - evt.ChannelId = m.channel.id;
  + // Webhooks don't send guild info.
  + evt.GuildId = guildId;
  + evt.ChannelId = channelId;
  this.store.Insert(evt);
  });
  return;
  