fix for color downgrade

[willmcgugan]

Fix the color reduction algorithm for 16.7 million colors to xterm 256 colors

[codecov-commenter]

Codecov Report

Base: 98.50% // Head: 98.51% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (056f43a) compared to base (88cf996).
Patch coverage: 100.00% of modified lines in pull request are covered.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2785   +/-   ##
=======================================
  Coverage   98.50%   98.51%           
=======================================
  Files          74       74           
  Lines        7917     7920    +3     
=======================================
+ Hits         7799     7802    +3     
  Misses        118      118           

Flag	Coverage Δ
unittests	98.51% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
rich/progress.py	92.92% <ø> (ø)
rich/color.py	100.00% <100.00%> (ø)
rich/theme.py	100.00% <100.00%> (ø)

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