[atlas] Mistakenly sent "please register your probe" emails

Dear RIPE Atlas users, As part of our regular development schedule, the development team rolled out a new version of the infrastructure components yesterday. As a side-effect, due to a mistake on our end, some users received emails urging them to register their probe(s), even though this has already been done. If you got such a mail although you've done your part, then please ignore this mail. Our apologies for the confusion. Regards, Robert Kisteleki