Minor improvement on CJK mess detection

[Ousret]

Tests are in progress to validate this patch.
We encountered a small decrease in CJK confidence/mess detection in the 1.4 release. This PR aims to correct that.

The gain is minor.

[codecov-commenter]

Codecov Report

Merging #43 (ce01b29) into master (84c4dae) will decrease coverage by 0.12%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
- Coverage   83.73%   83.61%   -0.13%     
==========================================
  Files          14       14              
  Lines         984      995      +11     
==========================================
+ Hits          824      832       +8     
- Misses        160      163       +3     

Impacted Files	Coverage Δ
charset_normalizer/probe_chaos.py	79.77% <76.92%> (-0.47%)	⬇️
charset_normalizer/unicode.py	93.60% <100.00%> (ø)

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[Ousret]

Closing in favor of #45