improve test coverage for S1

[j08lue]

No description provided.

[codecov]

Codecov Report

Merging #6 into master will increase coverage by 13.61%.
The diff coverage is 90.9%.

@@             Coverage Diff             @@
##           master       #6       +/-   ##
===========================================
+ Coverage   60.02%   73.63%   +13.61%     
===========================================
  Files          21       21               
  Lines         943      914       -29     
===========================================
+ Hits          566      673      +107     
+ Misses        377      241      -136

Impacted Files	Coverage Δ
src/satmeta/s1/to_geopandas.py	89.83% <100%> (+89.83%)	⬆️
src/satmeta/s1/filesearch.py	58.22% <84.21%> (+58.22%)	⬆️
src/satmeta/s1/meta.py	85.41% <0%> (+16.66%)	⬆️

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