fixing most of pycodestyle E271

[fchapoton]

📚 Description

This fixes most of pycodestyle E271 warnings (E271 multiple spaces after keyword).

There remains only a few inside modular/

📝 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

[vbraun]

Merge conflict

[codecov-commenter]

Codecov Report

Patch coverage: 87.50% and project coverage change: -0.02 ⚠️

Comparison is base (c00e6c2) 88.62% compared to head (eccca8a) 88.60%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #35123      +/-   ##
===========================================
- Coverage    88.62%   88.60%   -0.02%     
===========================================
  Files         2148     2148              
  Lines       398855   398855              
===========================================
- Hits        353480   353419      -61     
- Misses       45375    45436      +61     

Impacted Files	Coverage Δ
src/sage/categories/function_fields.py	87.50% <0.00%> (ø)
src/sage/databases/knotinfo_db.py	45.61% <0.00%> (ø)
...e/geometry/hyperbolic_space/hyperbolic_isometry.py	88.88% <ø> (ø)
src/sage/tensor/modules/tensor_with_indices.py	89.63% <33.33%> (ø)
src/sage/graphs/generic_graph.py	89.02% <50.00%> (-0.58%)	⬇️
src/sage/groups/cubic_braid.py	90.83% <71.42%> (ø)
src/sage/knots/knotinfo.py	83.30% <77.77%> (ø)
src/sage/algebras/fusion_rings/f_matrix.py	87.93% <100.00%> (ø)
src/sage/coding/information_set_decoder.py	98.31% <100.00%> (ø)
src/sage/combinat/matrices/hadamard_matrix.py	85.89% <100.00%> (ø)
... and 22 more

... and 24 files with indirect coverage changes

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[github-actions]

Documentation preview for this PR is ready! 🎉
Built with commit: eccca8a

[fchapoton]

setting back to positive after easy merge