Chart: Improve min, max & step on yAxis

[Pierre-Gilles]

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Description of change

Fix https://community.gladysassistant.com/t/modification-ordonnee-min-max-graphiques/9297

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.54%. Comparing base (90757c1) to head (22f5985).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2207   +/-   ##
=======================================
  Coverage   98.54%   98.54%           
=======================================
  Files         876      876           
  Lines       14455    14455           
=======================================
  Hits        14244    14244           
  Misses        211      211           

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