No longer ignores -J or --no_threads

[simsong]

closes #438

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (724bc63) 48.73% compared to head (7e2f14c) 48.73%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/bulk_extractor.cpp	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #439   +/-   ##
=======================================
  Coverage   48.73%   48.73%           
=======================================
  Files         112      112           
  Lines       13050    13052    +2     
=======================================
+ Hits         6359     6360    +1     
- Misses       6691     6692    +1     

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