feat(APIAuditLogChange): add missing keys

[fiftyy]

Please describe the changes this PR makes and why it should be merged:
Missing keys, found it while doing some stuff with forum channels.

		const auditLogEntry = (await newChannel.guild.fetchAuditLogs({ type: AuditLogEvent.ChannelUpdate, limit: 1 })).entries.first();
		auditLogEntry.changes.forEach((change) => {
			console.log(change.key + " -> " + JSON.stringify(change.new))
        });

flags -> 16
available_tags -> [{"id":"1227019093945618513","name":"g","emoji_id":"1171597283180163152","emoji_name":null,"moderated":false},{"id":"1227019128099962970","name":"Refund","emoji_id":null,"emoji_name":"💯","moderated":false},{"id":"1227019436351819937","name":"Question","emoji_id":null,"emoji_name":"❔","moderated":false},{"id":"1227019287827578952","name":"Priority: High","emoji_id":null,"emoji_name":"⚠️","moderated":false},{"id":"1232485370864865300","name":"fggfgdhj","emoji_id":"999745369527308358","emoji_name":null,"moderated":false}]
default_reaction_emoji -> undefined
default_reaction_emoji -> {"emoji_id":"986427353230098543","emoji_name":null}
default_thread_rate_limit_per_user -> 30

If applicable, please reference Discord API Docs PRs or commits that influenced this PR:

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