Generic locale fixes for RHEL

[JSCU-CNI]

This PR adds some small locale fixes for RHEL targets.

[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.

Project coverage is 75.52%. Comparing base (905f5e6) to head (ded1f97).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
dissect/target/plugins/os/unix/linux/_os.py	50.00%	1 Missing ⚠️
dissect/target/plugins/os/unix/locale.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #840      +/-   ##
==========================================
- Coverage   75.53%   75.52%   -0.01%     
==========================================
  Files         305      305              
  Lines       26356    26362       +6     
==========================================
+ Hits        19907    19911       +4     
- Misses       6449     6451       +2     

Flag	Coverage Δ
unittests	75.52% <81.81%> (-0.01%)	⬇️

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[Schamper]

Can you satisfy the linter?

[JSCU-CNI]

Fixed with ded1f97.