imply inactive_account -> bad_id

BUR #5595 has been approved by @evazion.

create implication inactive_account -> bad_id

As the wiki says, it's a subset.

The bulk update request #5595 (forum #186721) has been approved by @evazion.

I feel like we have a million tags for different ways of saying the source is dead, and I'm not sure why. Does it really matter if the source is dead because the artist's account was deleted, versus the post being deleted? Either way, there's nothing we can do about it.