chore: fix total_filtered computation

[jacquesfize]

resolves #75

[lpofredc]

@jacquesfize, Ca fonctionne! Merci ;)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.70%. Comparing base (619b3ca) to head (d9bd27a).
⚠️ Report is 45 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #76      +/-   ##
===========================================
+ Coverage    82.65%   89.70%   +7.04%     
===========================================
  Files            4        9       +5     
  Lines          271      544     +273     
===========================================
+ Hits           224      488     +264     
- Misses          47       56       +9     

Flag	Coverage Δ
pytest	89.70% <100.00%> (+7.04%)	⬆️

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