No alpha testing for 1st layer

The bottom layer of the model does not correctly render with alpha textures, leaving the what-should-be invisible parts rendered.

Should be quite a simple fix (in fact I did fix the problem myself):

The alpha tested material (def_pickel_001a) is only set for the outer layer, but the inner layer still uses def_pickel_001 (doesn't correctly render alpha), so the alpha tested material simply has to be applied to the inner layer. However, there is still a small error with this material as it doesn't render semi-transparent pixels, and rounds pixel alpha to the nearest integer.