Fix intcomma with ndigits=0

[hugovk]

Fixes #24.

Changes proposed in this pull request:

• Before:
  • humanize.intcomma(12345.111, ndigits=0) == "12,345.111"
• After:
  • humanize.intcomma(12345.111, ndigits=0) == "12,345"

[codecov-commenter]

Codecov Report

Merging #26 (03863fe) into main (29d37fb) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #26   +/-   ##
=======================================
  Coverage   99.09%   99.09%           
=======================================
  Files           9        9           
  Lines         666      666           
=======================================
  Hits          660      660           
  Misses          6        6           

Flag	Coverage Δ
macos-latest	97.89% <100.00%> (ø)
ubuntu-latest	97.89% <100.00%> (ø)
windows-latest	97.59% <100.00%> (ø)

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Impacted Files	Coverage Δ
tests/test_number.py	100.00% <ø> (ø)
src/humanize/number.py	96.89% <100.00%> (ø)

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