Difference in application of "is-open" for accordion and accordiontoggle widgets.

[darkodevubc]

While migrating one of our custom collapsible widgets from CK4 to CK5 and making it work with your accordiontoggle widget, my Work Learn, Andie, noticed that your accordiontoggle widget appends the "is-open" class only to the "js-reveal__trigger accordion__trigger" classes, whereas the accordion widget also applies it to the parent "widget-accordion" class.

She says this is causing an issue when applying the CSS classes to our migrated widget in a consistent way.