[Tile-serving] [openstreetmap/mod_tile] Improve `gen_tile_test` test coverage (PR #382)

[Codecov Comments Bot]

## [Codecov](https://app.codecov.io/gh/openstreetmap/mod_tile/pull/382?src=pr&el=h1&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openstreetmap) Report
All modified and coverable lines are covered by tests :white_check_mark:
> Comparison is base [(`9408604`)](https://app.codecov.io/gh/openstreetmap/mod_tile/commit/9408604811bdb8467b22b35f99ded46bd8996320?el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openstreetmap) 65.22% compared to head [(`ddaa1d8`)](https://app.codecov.io/gh/openstreetmap/mod_tile/pull/382?src=pr&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openstreetmap) 68.32%.


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<details><summary>Additional details and impacted files</summary>


```diff
@@            Coverage Diff             @@
##           master     #382      +/-   ##
==========================================
+ Coverage   65.22%   68.32%   +3.09%     
==========================================
  Files          23       23              
  Lines        4615     4615              
==========================================
+ Hits         3010     3153     +143     
+ Misses       1605     1462     -143     
```



</details>

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