D12148: update the wallpaper dialog to the new design

[Marco Martin]

mart added a comment.


  F5805373: Spectacle.H23326.png <https://phabricator.kde.org/F5805373>

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D12148

To: mart, #plasma, #vdg
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, 
jensreuterberg, abetts, sebas, apol, mart