Don't rerun alff if num threads changes

[mattcieslak]

The n_threads input shouldn't trigger a re-run if it changes. This prevents that from happening

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.42%. Comparing base (bc45d11) to head (fba9fc3).
Report is 47 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1263   +/-   ##
=======================================
  Coverage   78.42%   78.42%           
=======================================
  Files          59       59           
  Lines        7218     7218           
  Branches     1064     1064           
=======================================
  Hits         5661     5661           
  Misses       1286     1286           
  Partials      271      271           

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