cptbox: use correct result registers for arm64

[quantum5]

No description provided.

[codecov-commenter]

Codecov Report

Merging #943 (8485888) into master (342807a) will decrease coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #943      +/-   ##
==========================================
- Coverage   86.53%   86.41%   -0.13%     
==========================================
  Files         138      138              
  Lines        4702     4702              
==========================================
- Hits         4069     4063       -6     
- Misses        633      639       +6     

Impacted Files	Coverage Δ
dmoj/cptbox/tracer.py	83.27% <0.00%> (-1.82%)	⬇️
dmoj/result.py	89.33% <0.00%> (-1.34%)	⬇️

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