GDALFeature: Remove unneeded size_t set overload

[dbaston]

Fixes #113

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.52%. Comparing base (0e13cb4) to head (980479f).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #117      +/-   ##
==========================================
- Coverage   90.53%   90.52%   -0.01%     
==========================================
  Files          85       85              
  Lines        6086     6082       -4     
  Branches      612      611       -1     
==========================================
- Hits         5510     5506       -4     
  Misses        544      544              
  Partials       32       32              

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