Log wastebin events into the private moderation log

[danirod]

When the 🗑️ emoji is used to delete a priorly wanned message, the bot should send anotice into the private moderation log to mark the warned message as deleted. This should be done to indicate other moderators that the message was deleted, to avoid having them click the message and wonder where it is, or to avoid them spending time thinking if it's worth keeping the warned message or not if another moderator has already chosen so.