Mobs shouldn't play other sounds while playing damage sound / dying

When a zombie takes damage or is dying, it is possible for its damage sound to play while the normal zombie growl is playing. (The same effect happens with all mobs that play a "growl" sound)

This hurts gameplay, because when fighting off a horde of zombies, the final one can troll the player into thinking there's another zombie somewhere, because it sounds like two zombies are making sounds