Fix the sample function

[tpoisot]

Closes #194

[github-actions]

Documentation for this PR at https://poisotlab.github.io/SpeciesDistributionToolkit.jl/previews/PR195/

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -1.05 ⚠️

Comparison is base (dd9248f) 53.36% compared to head (147c3f8) 52.32%.

❗ Current head 147c3f8 differs from pull request most recent head 65aa55c. Consider uploading reports for the commit 65aa55c to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #195      +/-   ##
==========================================
- Coverage   53.36%   52.32%   -1.05%     
==========================================
  Files          59       38      -21     
  Lines        1692     1034     -658     
==========================================
- Hits          903      541     -362     
+ Misses        789      493     -296     

Flag	Coverage Δ
unittests	52.32% <ø> (-1.05%)	⬇️

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see 21 files with indirect coverage changes

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