Correcting the computation of the net price based on pant

[kjagiello]

No description provided.

[codecov]

Codecov Report

Merging #31 into develop will decrease coverage by -0.06%.
The diff coverage is 86.95%.

@@             Coverage Diff             @@
##           develop      #31      +/-   ##
===========================================
- Coverage    89.44%   89.38%   -0.06%     
===========================================
  Files           73       73              
  Lines         2519     2534      +15     
  Branches       135      137       +2     
===========================================
+ Hits          2253     2265      +12     
- Misses         245      246       +1     
- Partials        21       23       +2

Impacted Files	Coverage Δ
src/shop/suppliers/base.py	100% <ø> (ø)	✅
src/shop/tests/test_narlivs.py	100% <100%> (ø)	✅
src/shop/suppliers/narlivs.py	78.43% <70%> (-4.18%)	❌
src/shop/models.py	84.07% <0%> (ø)	✅

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