Blender Git Loki

Fix T62874: Crash Texture shading+Transparency

When texure shading is enabled, the transparency accum shaders were not set/updated.
This resulted into a crash when transparent objects were rendered when shading mode
was set to texture.

This patch will add the V3D_SHADING_TEXTURE_COLOR to the modes for OIT so the
shaders are set.

Reviewed By: fclem

Maniphest Tasks: T62874

Differential Revision: https://developer.blender.org/D4592