Sonification demos no longer working with v8.0.1

[oysteinmoseng]

Because of the new sonification options, where sonification by default is enabled: false, none of the sonification demos using chart.sonify are working anymore.

Example: https://jsfiddle.net/gh/get/library/pure/highcharts/highcharts/tree/master/samples/highcharts/demo/sonification/

We should probably change the behavior of chart.sonify() to sonify the charts regardless of whether or not the option is enabled on the chart - and not call this function internally if the option is false.

Workaround for now is either rolling back to v8.0.0 of the sonification module, or setting the sonification.enabled option to true for the chart.