DynamicCamMap disabled texture incorrect.

[Hoikas]

When Korman exports a DynamicCamMap, it generates a "disabled texture," which is a layer with no texture set - just a color. Under the hood, if no texture image is present on the "disabled texture" layer, then the DynamicCamMap is forced to render, even if the user has turned off planar reflections. We need to export disabled textures correctly to allow the user to properly disable things.