Fix Validation from Undefined to ShaderReadOnlyOptimal https://www.khronos.org/registry/vulkan/specs/1.1-extensions/html/vkspec.html#VUID-VkWriteDescriptorSet-descriptorType-01403
Fix Validation from Undefined to ShaderReadOnlyOptimal https://www.khronos.org/registry/vulkan/specs/1.1-extensions/html/vkspec.html#VUID-VkWriteDescriptorSet-descriptorType-01403

gfx-rs/gfx-rs