Do not set global RNG of `scipy.skewnorm`

[dachengx]

fuse/fuse/plugins/detector_physics/s2_photon_propagation.py

Line 300 in fa3c803

skewnorm.random_state = self.rng

This line of code sets a global RNG of scipy.skewnorm. This might not be an issue when single-thread processing, but it might be dangerous when cross-thread because we can not predict the execution order of threads.

The safe code will be skewnorm.rvs(..., random_state=rng).