Fix bug in EventFilters.cs

[towsey]

See Issue #466 - Fix bug in EventFilters.cs

Changes

Shifted two lines of code to correct location i.e. after necessary checks have determined the list contains something to write.

Final Checklist

• Assign reviewers if you have permission
• Assign labels if you have permission
• Link issues related to PR
• Link any PRs or issues blocking this PR from being merged
• Remove/Reduce warnings from edited files
• [X ] no unit tests affected.

[codecov]

Codecov Report

Merging #475 (9cda490) into master (eadb4b1) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff            @@
##           master    #475      +/-   ##
=========================================
- Coverage    0.71%   0.70%   -0.02%     
=========================================
  Files         471     471              
  Lines       48647   48647              
  Branches     7667    7667              
=========================================
- Hits          350     344       -6     
- Misses      48246   48253       +7     
+ Partials       51      50       -1     

Impacted Files	Coverage Δ
src/AudioAnalysisTools/Events/EventFilters.cs	0.00% <0.00%> (ø)
src/Acoustics.Shared.FSharp/matrix.fs	4.99% <0.00%> (-0.40%)	⬇️

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