Remove target labels in the method comparison example

[antoinedemathelin]

Hi everyone,
I open this PR to fix a little bug in the plot_method_comparison.py example. Target labels were given to the fit methods, they are now removed (cf. #83).

The reweighting method are still not working, but it should be resolved soon, with PR #90

[rflamary]

Hello @antoinedemathelin yes this is inetresting. I think we need to modify the calls to the make_shifted_dataset function to return a DomainAwareDataset insteda of recereating one from X,y, sampledomain

[kachayev]

Quick suggestion to what @rflamary said: passing return_dataset=True argument to make_shifted_dataset will give you dataset right away.

[antoinedemathelin]

Ok, it now uses the return_dataset=True argument, then the dataset API

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b834a66) 88.54% compared to head (c8e5587) 88.50%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #92      +/-   ##
==========================================
- Coverage   88.54%   88.50%   -0.04%     
==========================================
  Files          41       41              
  Lines        2601     2601              
==========================================
- Hits         2303     2302       -1     
- Misses        298      299       +1     

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