fix E502 in schemes and combinat

[fchapoton]

📚 Description

fix pycodestyle E502 warning in schemes/ and combinat/

📝 Checklist

• I have made sure that the title is self-explanatory and the description concisely explains the PR.
• I have linked an issue or discussion.
• I have created tests covering the changes.
• I have updated the documentation accordingly.

⌛ Dependencies

[codecov-commenter]

Codecov Report

Patch coverage: 78.86% and project coverage change: -0.01 ⚠️

Comparison is base (c00e6c2) 88.62% compared to head (5fa42e9) 88.62%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #35318      +/-   ##
===========================================
- Coverage    88.62%   88.62%   -0.01%     
===========================================
  Files         2148     2148              
  Lines       398855   398857       +2     
===========================================
- Hits        353480   353476       -4     
- Misses       45375    45381       +6     

Impacted Files	Coverage Δ
src/sage/combinat/designs/difference_family.py	88.75% <0.00%> (ø)
src/sage/combinat/integer_vector.py	93.16% <0.00%> (-0.26%)	⬇️
src/sage/schemes/generic/point.py	75.00% <0.00%> (ø)
.../sage/schemes/product_projective/rational_point.py	83.10% <0.00%> (ø)
...hyperelliptic_curves/hyperelliptic_finite_field.py	90.74% <33.33%> (ø)
src/sage/schemes/berkovich/berkovich_space.py	85.03% <50.00%> (ø)
src/sage/schemes/curves/affine_curve.py	83.66% <50.00%> (ø)
src/sage/schemes/hyperelliptic_curves/mestre.py	81.81% <50.00%> (ø)
...c/sage/combinat/finite_state_machine_generators.py	97.57% <80.00%> (ø)
src/sage/schemes/projective/projective_morphism.py	91.01% <85.41%> (+0.01%)	⬆️
... and 16 more

... and 28 files with indirect coverage changes

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[kwankyu]

LGTM.

[vbraun]

merge conflict

[vbraun]

conflicts with #35314

[kwankyu]

I suggest to rebase onto the next beta.

[fchapoton]

setting back to positive after trivial merge

[github-actions]

Documentation preview for this PR is ready! 🎉
Built with commit: 0ee39ac