Fix the color to avoid to have a random color when navigate

[xavierfacq]

Fix the color to avoid to have a random color when navigate in the drilldown.

💡 In the futur, an idea could be to have a different color per level

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[codecov]

Codecov Report

Merging #372 (876096a) into main (de68730) will increase coverage by 0.03%.
Report is 1 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #372      +/-   ##
==========================================
+ Coverage   95.08%   95.11%   +0.03%     
==========================================
  Files           9        9              
  Lines         875      881       +6     
  Branches       66       66              
==========================================
+ Hits          832      838       +6     
  Misses         43       43              

Files	Coverage Δ
src/Graph/BarChart.tsx	100.00% <100.00%> (ø)
src/Graph/ColumnDrilldown.tsx	93.17% <100.00%> (+0.10%)	⬆️

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