Combined hillshade: error in rastertools.hillshade output path path

It looks like the filename given to "compute_combined_hillshade_mask" is already prepended with the folder, which lead to it being prepended once again in the method.

https://gitlab.orfeo-toolbox.org/remote_modules/let-it-snow/-/blob/develop/python/s2snow/snow_detector.py?ref_type=heads#L172