steve_mers.tga for steve head block also applies to all Minecraft skins including customs skins

When using Vibrant Visual, the steve head skins has a mers.tga texture to benefit from MERS features. However, it also affacted your skin.

Step to reproduce:

1. Create a custom resource pack

2. Create a full green steve_mers.tga (HEXA:00FF00) inside of \textures\entity in order to get the best result

3. You will notice the steve head block will have emissive as well as your skin.