Cast the switch selector in GLSL to uint32_t
Cast the switch selector in GLSL to uint32_t

We can safely cast the value since we check previously that we're not
using a uint64_t as the selector.

Signed-off-by: Sebastián Aedo <c7b9a56f5165ab2bd774f91917113b46805c5aa8@codeweavers.com>

KhronosGroup/SPIRV-Cross,KhronosGroup/SPIRV-Cross,KhronosGroup/SPIRV-Cross,KhronosGroup/SPIRV-Cross,KhronosGroup/SPIRV-Cross,KhronosGroup/SPIRV-Cross