Small change to getModuleRNG for readability

[jeremykubica]

A very small change to make getModuleRNG more readable. Breaks the seed_offset into two lines. The first does the hashing (and uses the default encoding). The second maps the hashed value to an integer (making the base argument explicit).

Also adds a very small change from running black.

Review Checklist for Source Code Changes

• Does pip install still work?
• Have you written a unit test for any new functions?
• Do all the units tests run successfully?
• Does Sorcha run successfully on a test set of input files/databases?
• Have you used black on the files you have updated to confirm python programming style guide enforcement?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b58fba3) 74.67% compared to head (76ef564) 74.68%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #764   +/-   ##
=======================================
  Coverage   74.67%   74.68%           
=======================================
  Files          66       66           
  Lines        3029     3030    +1     
=======================================
+ Hits         2262     2263    +1     
  Misses        767      767           

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