Double init warning when running Turbo

[cernyjakub]

rails_charts/lib/rails_charts/base_chart.rb

Line 73 in 94c212c

window.addEventListener('load', init_#{chart_id});

When running Turbo, both 'load' and 'turbo:load' events are fired on initial page load. This brings

[ECharts] There is a chart instance already initialized on the dom.

warning into the console. Maybe the event to use for init could be put into config, so we could use which one to use. under Turbo, using 'load' is not needed.