Fix a typo

[jk-jeon]

Found in jk-jeon/dragonbox#66.

According to @tobybell, it appears to work even with UINT32_C but it's definitely a typo anyway.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.1%. Comparing base (4554989) to head (d2105e4).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #723     +/-   ##
=========================================
- Coverage     99.1%   99.1%   -0.0%     
=========================================
  Files          229     229             
  Lines        16430   16430             
  Branches      1781    1781             
=========================================
- Hits         16277   16276      -1     
- Misses         153     154      +1     

Files	Coverage Δ
...ude/boost/decimal/detail/remove_trailing_zeros.hpp	100.0% <100.0%> (ø)

... and 1 file with indirect coverage changes

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[mborland]

Thank you for the patch!