Fix Arkansas reduction thresholds

[PavelMakarchuk]

Fixes #6873

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.85%. Comparing base (0ecb2c6) to head (9f434e9).
⚠️ Report is 28 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##            master    #6874       +/-   ##
============================================
- Coverage   100.00%   73.85%   -26.15%     
============================================
  Files            2     3285     +3283     
  Lines           39    47235    +47196     
  Branches         0      241      +241     
============================================
+ Hits            39    34885    +34846     
- Misses           0    12330    +12330     
- Partials         0       20       +20     

Flag	Coverage Δ
unittests	73.85% <ø> (-26.15%)	⬇️

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