stylistic fixups

[codecov[bot]]

Codecov Report

Patch coverage: 83.33% and project coverage change: -0.44 :warning:

Comparison is base (4557318) 91.70% compared to head (a882aec) 91.27%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #8 +/- ## ========================================== - Coverage 91.70% 91.27% -0.44% ========================================== Files 4 4 Lines 410 424 +14 ========================================== + Hits 376 387 +11 - Misses 34 37 +3 ``` | [Impacted Files](https://app.codecov.io/gh/OpenFreeEnergy/kartograf/pull/8?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=OpenFreeEnergy) | Coverage Δ | | |---|---|---| | [src/kartograf/atom\_mapper.py](https://app.codecov.io/gh/OpenFreeEnergy/kartograf/pull/8?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=OpenFreeEnergy#diff-c3JjL2thcnRvZ3JhZi9hdG9tX21hcHBlci5weQ==) | `87.60% <83.33%> (-0.56%)` | :arrow_down: |

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