Fix algorithm typo for float16 conversion table calculations

[almic]

I was looking at the original paper and noticed this number was different. I could not find any issues that would hint that this number was deliberately changed from -24 to -27, so I assume it must have been a mistake.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.09%. Comparing base (0d82f01) to head (3f1c0f1).
Report is 33 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1188      +/-   ##
==========================================
+ Coverage   87.06%   87.09%   +0.03%     
==========================================
  Files          12       12              
  Lines         773      775       +2     
  Branches      146      147       +1     
==========================================
+ Hits          673      675       +2     
  Misses         54       54              
  Partials       46       46              

Flag	Coverage Δ
unittests	87.09% <100.00%> (+0.03%)	⬆️

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[petamoriken]

Thanks!