Fix the GBIF issue for single argument queries

[tpoisot]

Closes #165

[github-actions]

Documentation for this PR at https://poisotlab.github.io/SpeciesDistributionToolkit.jl/previews/PR166/

[codecov-commenter]

Codecov Report

Patch coverage: 75.00% and project coverage change: -0.08 ⚠️

Comparison is base (ff4a23e) 54.55% compared to head (5c42bb6) 54.48%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #166      +/-   ##
==========================================
- Coverage   54.55%   54.48%   -0.08%     
==========================================
  Files          47       47              
  Lines        1514     1516       +2     
==========================================
  Hits          826      826              
- Misses        688      690       +2     

Flag	Coverage Δ
unittests	54.48% <75.00%> (-0.08%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
GBIF/src/occurrence.jl	90.00% <50.00%> (-3.23%)	⬇️
GBIF/src/query.jl	80.00% <100.00%> (+2.22%)	⬆️

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