Improve tests and fixes

[jmaspons]

• [ ] osm_full_object(format = "R") lost last object see https://github.com/jmaspons/osmapiR/blob/983c51fb826da73756dd800af5a5c7d1bbd3dab1/tests/testthat/test-elements.R#L611-L624

[codecov[bot]]

Codecov Report

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

Project coverage is 94.12%. Comparing base (6d8f3bc) to head (a00c770).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #34 +/- ## ========================================== + Coverage 93.05% 94.12% +1.07% ========================================== Files 27 27 Lines 2231 2248 +17 ========================================== + Hits 2076 2116 +40 + Misses 155 132 -23 ```

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