Allow highchartmore to be "init" several time without bug
Posted as an issue here https://github.com/highcharts/highcharts/issues/7729
In modern app, highcharts and highcharts more are loaded as module and potentially multiple time, but highcharts more cannot be "init" several time without breaking highcharts :(
Jérôme Steunou shared this idea
Fixed since v8.
If you find any other module that is broken that way, please report the bug on Github.