Revert "Split careless into CPU module and careless-gpu using cuda/12.8.1 module"

This reverts commit 20e69678da.

careless/modulefile

@@ -7,8 +7,9 @@ module-maintainer   "MX Data <jiaxin.duan@psi.ch>"
 
 module-help     "
 careless: scaling and merging of X-ray diffraction data using
-approximate Bayesian inference (TensorFlow). CPU build; for
-NVIDIA GPU nodes load careless-gpu instead.
+approximate Bayesian inference (TensorFlow). Installed with the
+[cuda] extra, so it uses NVIDIA GPUs when available and falls
+back to CPU otherwise.
 "
 
 setenv          CARELESS_ENV    $PREFIX/venv