Minor LCP fixes

[ppinchuk]

Drop NA category from features and new default barrier name in config for concistency

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 55.55556% with 4 lines in your changes missing coverage. Please review.

Project coverage is 82.70%. Comparing base (13fc8e8) to head (5145a1e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #220      +/-   ##
==========================================
- Coverage   82.72%   82.70%   -0.03%     
==========================================
  Files         118      118              
  Lines       14448    14454       +6     
==========================================
+ Hits        11952    11954       +2     
- Misses       2496     2500       +4     

Flag	Coverage Δ
unittests	82.70% <55.55%> (-0.03%)	⬇️

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Files	Coverage Δ
reVX/config/transmission_layer_creation.py	100.00% <100.00%> (ø)
reVX/least_cost_xmission/least_cost_xmission.py	89.03% <33.33%> (-0.91%)	⬇️