Handle negative magic number offsets in sample file generation

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[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 92.26%. Comparing base (d1916d1) to head (4fee622).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
fileformats/generic/generate_sample_data.py	66.66%	2 Missing and 1 partial ⚠️
fileformats/core/sampling.py	85.71%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #90      +/-   ##
==========================================
- Coverage   92.30%   92.26%   -0.05%     
==========================================
  Files          47       47              
  Lines        5317     5326       +9     
  Branches      610      612       +2     
==========================================
+ Hits         4908     4914       +6     
- Misses        299      301       +2     
- Partials      110      111       +1     

Flag	Coverage Δ
	92.18% <75.00%> (-0.05%)	⬇️

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