Imply single nipple piercing & mismatched nipple piercing to nipple piercing

BUR #39450 has been approved by @nonamethanks.

create implication single_nipple_piercing -> nipple_piercing
create implication mismatched_nipple_piercing -> nipple_piercing

These tags can only exist if a nipple piercing is present.

The bulk update request #39450 (forum #345088) has been approved by @nonamethanks.