I did a mistake please forgive

[helpful-fox-senko-san]

I messed up the 2 most basic shader presets (and also removed an important comment).

[helpful-fox-senko-san]

Updated to fix another mistake which caused specifically hair to not load cus 'h' started resolving to 'human' instead of 'hair' :sob:

[helpful-fox-senko-san]

Added another small fix where 4K textures without a full set of diffuse/normal/specular textures available throws an exception on model previews. (I didn't break this one!) + rebased