D11166: Simplify display when there's only a single device

[Chris Holland]

Zren added a comment.


  I remember having trouble binding to stuff in the `___Representation` in the `main.qml` too, but don't remember the specifics. Why not just define it in the `ColumnLayout { id: devicesView }` since it's not really needed elsewhere. `onlyOne: devicesView.simpleMode`, `visible: !devicesView.simpleMode`.

REPOSITORY
  R115 Plasma Audio Volume Applet

REVISION DETAIL
  https://phabricator.kde.org/D11166

To: ngraham, #plasma, drosca
Cc: Zren, plasma-devel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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