need to override fft_batch_size to 1, for software FFT always.

[anarkiwi]

No description provided.

[codecov]

Codecov Report

Patch coverage: 84.61% and project coverage change: +0.01% 🎉

Comparison is base (9f082ac) 75.81% compared to head (645de5f) 75.82%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #879      +/-   ##
==========================================
+ Coverage   75.81%   75.82%   +0.01%     
==========================================
  Files          41       41              
  Lines        3469     3471       +2     
==========================================
+ Hits         2630     2632       +2     
  Misses        839      839              

Files Changed	Coverage Δ
tests/test_grscan.py	100.00% <ø> (ø)
gamutrf/grscan.py	80.67% <84.61%> (+0.33%)	⬆️

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