Fix missing kwargs in FenchelYoungLoss with generalized maximizer

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (0493719) 89.78% compared to head (48aec0d) 89.78%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #97 +/- ## ======================================= Coverage 89.78% 89.78% ======================================= Files 24 24 Lines 695 695 ======================================= Hits 624 624 Misses 71 71 ``` | [Files Changed](https://app.codecov.io/gh/axelparmentier/InferOpt.jl/pull/97?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [src/imitation/fenchel\_young\_loss.jl](https://app.codecov.io/gh/axelparmentier/InferOpt.jl/pull/97?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-c3JjL2ltaXRhdGlvbi9mZW5jaGVsX3lvdW5nX2xvc3Muamw=) | `92.30% <100.00%> (ø)` | |

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