allow Nameless Helm (head_special_2 / headSpecial2) to be repurchased after you've owned it once - fixes https://github.com/HabitRPG/habitrpg/issues/3967
Merge pull request #297 from Alys/namelessHelmBuyable

allow Nameless Helm to be repurchased after Death/Rebirth - fixes https://github.com/HabitRPG/habitrpg/issues/3967