fix(GuildEmojiCreate): Prevent double fire from emoji creation (#4863)

Author: Jiralite

src/client/actions/GuildEmojiCreate.js

@@ -5,13 +5,14 @@ const { Events } = require('../../util/Constants');
 
 class GuildEmojiCreateAction extends Action {
   handle(guild, createdEmoji) {
+    const already = guild.emojis.cache.has(createdEmoji.id);
     const emoji = guild.emojis.add(createdEmoji);
     /**
      * Emitted whenever a custom emoji is created in a guild.
      * @event Client#emojiCreate
      * @param {GuildEmoji} emoji The emoji that was created
      */
-    this.client.emit(Events.GUILD_EMOJI_CREATE, emoji);
+    if (!already) this.client.emit(Events.GUILD_EMOJI_CREATE, emoji);
     return { emoji };
   }
 }