Fix T48556: Missing transparent shadows on AMD OpenCL
Fix T48556: Missing transparent shadows on AMD OpenCL

We had transparent shadows disabled for some time because they were causing
drivers to crash. Can't reproduce that issue anymore with current drivers,
so will enable them and see how it goes.

tangent-opensource/coreBlackbird,tangent-opensource/coreBlackbird,tangent-opensource/coreBlackbird