Piglins aren't scared of baby zombified piglins

Piglins aren’t scared of baby zombified piglins anymore since 26.0.

Steps to reproduce:

1. Spawn a piglin.

2. Summon a baby zombified piglin using /summon zombie_pigman ~~~~~ spawn_baby.

3. Watch how the piglin reacts.

Expected results:

• Piglin runs away.

Actual results:

• Piglin remains calm.

Additional notes:

• This is because baby zombified piglins are in an unnecessary family: baby_zombie_pigman instead of zombie_pigman, and piglins are scared of mobs in the latter family.