Geopolygon search fix

[SpacemanPaul]

Reason for this pull request

Internal call to output_geobox was broken for postgis driver.

• [x] Tests added / passed
• [x] Fully documented, including docs/about/whats_new.rst for all changes

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 85.26%. Comparing base (e368532) to head (1009d19). Report is 1 commits behind head on develop-1.9.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop-1.9 #1627 +/- ## ============================================ Coverage 85.26% 85.26% ============================================ Files 142 142 Lines 15602 15602 ============================================ Hits 13303 13303 Misses 2299 2299 ```

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