Fix codecov action conditional

[codecov[bot]]

Codecov Report

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

Project coverage is 96.35%. Comparing base (0c5d3bc) to head (4b18a0f). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #53 +/- ## ======================================= Coverage 96.35% 96.35% ======================================= Files 13 13 Lines 604 604 ======================================= Hits 582 582 Misses 22 22 ``` | [Flag](https://app.codecov.io/gh/OpenFreeEnergy/kartograf/pull/53/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=OpenFreeEnergy) | Coverage Δ | | |---|---|---| | [](https://app.codecov.io/gh/OpenFreeEnergy/kartograf/pull/53/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=OpenFreeEnergy) | `96.35% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=OpenFreeEnergy#carryforward-flags-in-the-pull-request-comment) to find out more.

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