Fix kw rrule

[dfdx]

No description provided.

[codecov-commenter]

Codecov Report

Merging #122 (e5e1e1c) into main (95fe094) will decrease coverage by 4.37%.
The diff coverage is 96.15%.

@@            Coverage Diff             @@
##             main     #122      +/-   ##
==========================================
- Coverage   84.33%   79.95%   -4.38%     
==========================================
  Files           9        8       -1     
  Lines         466      444      -22     
==========================================
- Hits          393      355      -38     
- Misses         73       89      +16     

Impacted Files	Coverage Δ
src/cr_api.jl	90.66% <ø> (-2.11%)	⬇️
src/utils.jl	50.00% <0.00%> (ø)
src/grad.jl	88.51% <100.00%> (+0.92%)	⬆️
src/rulesets.jl	87.37% <100.00%> (-2.39%)	⬇️
src/helpers.jl	29.23% <0.00%> (-24.62%)	⬇️

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