lockbutton: Revisit element name
lockbutton: Revisit element name

Instead of a separate element name, keep button, and just
add a .lock style class, to inherit the button theming.

grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita