remove doubled code from calc derived props

[arjunsavel]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 28.73%. Comparing base (6cbe1b3) to head (db4aa62).
Report is 15 commits behind head on main.

Files	Patch %	Lines
src/scope/calc_quantities.py	50.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #22      +/-   ##
==========================================
+ Coverage   28.43%   28.73%   +0.31%     
==========================================
  Files          11       11              
  Lines         795      797       +2     
==========================================
+ Hits          226      229       +3     
+ Misses        569      568       -1     

Flag	Coverage Δ
unittests	28.73% <50.00%> (+0.31%)	⬆️

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