Typo "spectrral"

While compiling Malia using

cmake -DCMAKE_BUILD_TYPE=Release -DMALIA_GPU_ARCHITECTURE=KEPLER -DRENDERER_INTERACTIVE=ON -DOptiX_INSTALL_DIR=${PATH}/NVIDIA-OptiX-SDK-6.5.0-linux64/

I've got

[...]
Installing Malia in .
Renderer Spectrral =  malia
[...]

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