Fix float conversion in vtkOpenGLGPUVolumeRayCastMapper.cxx
To reproduce, build with UBSan and run:
ctest -VV -R vtkRenderingVolumeCxx-TestGPURayCastMapperSampleDistance
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To reproduce, build with UBSan and run:
ctest -VV -R vtkRenderingVolumeCxx-TestGPURayCastMapperSampleDistance