Now obsolete _even_if_dead scope usages modernized

Only affects mother_even_if_death and father_even_if_dead.  They mean the same thing as mother and father, properly implemented, but the scopes weren't properly implemented previously.  Further, the _even_if_dead versions have been deemed buggy at best, and Doomdark officially obsoleted them on the forums a few months ago, pre-RoI.