StarTexture in env_skypaint only textures top half of sky

[ts-co]

Details

This probably isn't a bug, but seeing as there is no way to change it's default behavior it would be nice if the startexture for env_skypaint encompassed all layers of the skybox instead of just the top part. This would also be more consistent with the the rest of the sky paint editor as setting ambient levels also changes the color on the bottom.

Use cases: Space games 😄

Steps to reproduce

Using star textures in env_skypaint will only texture the top half of the skybox