[Tile-serving] [openstreetmap/mod_tile] Fix `DEFAULT_ATTRIBUTION` value and add tests (PR #360)

[Codecov Comments Bot]

## [Codecov](https://app.codecov.io/gh/openstreetmap/mod_tile/pull/360?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 [(`925183a`)](https://app.codecov.io/gh/openstreetmap/mod_tile/commit/925183a960c7390258649e4096c08d31f7e416b9?el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openstreetmap) 45.14% compared to head [(`facf8b0`)](https://app.codecov.io/gh/openstreetmap/mod_tile/pull/360?src=pr&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openstreetmap) 48.29%.


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


```diff
@@            Coverage Diff             @@
##           master     #360      +/-   ##
==========================================
+ Coverage   45.14%   48.29%   +3.15%     
==========================================
  Files          23       23              
  Lines        4601     4601              
==========================================
+ Hits         2077     2222     +145     
+ Misses       2524     2379     -145     
```



</details>

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