fix: fix bug in filter normalization in spectra v2 form

[tlambert03]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.72%. Comparing base (ce48168) to head (46ae81b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #411      +/-   ##
==========================================
- Coverage   62.73%   62.72%   -0.02%     
==========================================
  Files         115      115              
  Lines        9200     9200              
==========================================
- Hits         5772     5771       -1     
- Misses       3428     3429       +1     

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