[Tile-serving] [openstreetmap/mod_tile] Minor coverage improvements and CTest clean up (PR #361)

[Codecov Comments Bot]

## [Codecov](https://app.codecov.io/gh/openstreetmap/mod_tile/pull/361?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 [(`4a42757`)](https://app.codecov.io/gh/openstreetmap/mod_tile/commit/4a42757f2ed2981a563062ec24f5f914e6bb4e56?el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openstreetmap) 48.29% compared to head [(`0a04d07`)](https://app.codecov.io/gh/openstreetmap/mod_tile/pull/361?src=pr&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openstreetmap) 49.16%.


:exclamation: Your organization needs to install the [Codecov GitHub app](https://github.com/apps/codecov/installations/select_target) to enable full functionality.

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


```diff
@@            Coverage Diff             @@
##           master     #361      +/-   ##
==========================================
+ Coverage   48.29%   49.16%   +0.86%     
==========================================
  Files          23       23              
  Lines        4601     4601              
==========================================
+ Hits         2222     2262      +40     
+ Misses       2379     2339      -40     
```



</details>

[:umbrella: View full report in Codecov by Sentry](https://app.codecov.io/gh/openstreetmap/mod_tile/pull/361?src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openstreetmap).   
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