Fix axis names

[baskrahmer]

What does this PR do?

Fixes a small bug where the axis labels are not added if the input type is a list instead of a Tensor. I also made the plotting linestyle similar for these two input types.

Part of #2405

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• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

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📚 Documentation preview 📚: https://torchmetrics--2462.org.readthedocs.build/en/2462/

[codecov]

Codecov Report

Merging #2462 (42f3b3b) into master (9d76f3f) will decrease coverage by 0%.
Report is 27 commits behind head on master.
The diff coverage is 0%.

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #2462   +/-   ##
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- Coverage      69%     69%   -0%     
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  Files         307     307           
  Lines       17363   17357    -6     
======================================
- Hits        11961   11952    -9     
- Misses       5402    5405    +3     

[Borda]

could you pls add screenshot before and after? :)

[baskrahmer]

could you pls add screenshot before and after? :)

Sure! Before:

After:

Negative AUC values are unrelated to my changes, but still a bit strange 😛 can have a look some other time