Fix typo in testing of infeasible parameters

[codecov[bot]]

Codecov Report

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

Comparison is base (00807b2) 91.59% compared to head (584f9da) 91.59%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #25 +/- ## ======================================= Coverage 91.59% 91.59% ======================================= Files 5 5 Lines 119 119 ======================================= Hits 109 109 Misses 10 10 ``` | [Flag](https://app.codecov.io/gh/lassepe/ParametricMCPs.jl/pull/25/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Lasse+Peters) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/lassepe/ParametricMCPs.jl/pull/25/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Lasse+Peters) | `91.59% <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=Lasse+Peters#carryforward-flags-in-the-pull-request-comment) to find out more.

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