Fix typo in rounding

[LilithHafner]

Fixes #176

[codecov]

Codecov Report

Patch coverage: 50.00% and project coverage change: -0.24% ⚠️

Comparison is base (23c52bd) 49.41% compared to head (1bb0f70) 49.18%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #177      +/-   ##
==========================================
- Coverage   49.41%   49.18%   -0.24%     
==========================================
  Files          63       63              
  Lines        3422     3422              
==========================================
- Hits         1691     1683       -8     
- Misses       1731     1739       +8     

Files Changed	Coverage Δ
src/math/prearith/floorceiltrunc.jl	59.49% <50.00%> (+2.53%)	⬆️

... and 2 files with indirect coverage changes

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