Add default to options parameter in listCustomEmoji (#13031)

Regression: List of custom emojis wasn't working

packages/rocketchat-emoji-custom/server/methods/listEmojiCustom.js

@@ -2,7 +2,7 @@ import { Meteor } from 'meteor/meteor';
 import { RocketChat } from 'meteor/rocketchat:lib';
 
 Meteor.methods({
-	listEmojiCustom(options) {
+	listEmojiCustom(options = {}) {
 		return RocketChat.models.EmojiCustom.find(options).fetch();
 	},
 });