js/numerical_axis.js: fix

See #2731.
5 jobs for prod-client
Status Job ID Name Coverage
  Test Quality
canceled #41877
code_quality

 
  Test Unit
canceled #41878
test_browser_unit

 
  Test Functional
canceled #41879
test_browser-functional

 
  Test Functional External
canceled #41880
test_browser-functional-external

 
  Deploy Prod
canceled #41881
deploy_prod