positive values in item default dye tint values don't work

When the default tint value for dye is positive, the layer becomes invisible.

This makes it slightly unintuitive to copy over the normally positive number that would be associated with the desired dye color.

Steps to reproduce:

1. Download and use the resource pack

2. Spawn in the item below

3. /give @p minecraft:music_disc_blocks[
     !minecraft:jukebox_playable,
     minecraft:item_name={"text":"Dye Test"},
     minecraft:item_model="minecraft:dye_test",
     minecraft:equippable={
       slot: "head",
       asset_id: "minecraft:dye_test"
     }
   ]

4. Notice that the tint layer does not show

If you go to [assets/minecraft/items/dye.test.json] you will be presented with the following where you can change the number and see that only negative values work.

{
  "model": {
    "type": "minecraft:model",
    "model": "minecraft:item/dye_test",
    "tints": [
      {
        "type": "minecraft:dye",
        "default": -14558758
      }
    ]
  }
}