with the rename of this (beta) widget, the efl/ group name is set so
add this to the theme for now until more work can be done here to resolve
the rest of the theme namespacing issues which will only be an issue
if the widget is ever made stable
ref T7713
Reviewed-by: Marcel Hollerbach <mail@marcel-hollerbach.de>
Differential Revision: https://phab.enlightenment.org/D8393