fix: fix ylim in tsplot for non-centered yaxis

[dkrako]

pylint draw some attention to some erronuous logic in tsplot in #725

This makes sure that ylims is really set by handling the not zero_centered_yaxis branch

[codecov[bot]]

Codecov Report

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

Project coverage is 100.00%. Comparing base (653f52a) to head (5a63b5d).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #729 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 60 60 Lines 2801 2806 +5 Branches 712 712 ========================================= + Hits 2801 2806 +5 ```

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