Remove lineHeight property from ScaleTitle (#7477)
Remove lineHeight property from ScaleTitle (#7477)

`lineHeight` it should not be used anymore because inside the `Font` object
touletan/Chart.js,chartjs/Chart.js,chartjs/Chart.js,touletan/Chart.js,chartjs/Chart.js,touletan/Chart.js,touletan/Chart.js,nnnick/Chart.js,chartjs/Chart.js