Disable default item helmet rendering if the item has a custom ArmorRenderer

[Juuxel]

When an item is in the head slot, if it's not an ArmorItem, it will be rendered using its model (or some other special code like with skulls).

This also happens when a non-ArmorItem has a custom ArmorRenderer set using Fabric API. IMO using a custom renderer should disable the default rendering, since currently the game would render the item "twice":

1. with the vanilla rendering as the item model
2. with the custom ArmorRenderer