front : fix rounding budget in a study and a scenario

[younesschrifi]

Close #3170

[codecov]

Codecov Report

Merging #3352 (5c47889) into dev (7bf8785) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                dev    #3352      +/-   ##
============================================
+ Coverage     66.86%   66.90%   +0.03%     
  Complexity     1876     1876              
============================================
  Files           396      396              
  Lines         19106    19106              
  Branches       1488     1489       +1     
============================================
+ Hits          12776    12782       +6     
+ Misses         5654     5647       -7     
- Partials        676      677       +1     

Flag	Coverage Δ
front	52.43% <100.00%> (+0.07%)	⬆️

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Impacted Files	Coverage Δ
front/src/utils/numbers.ts	72.22% <100.00%> (+33.33%)	⬆️

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