D5440: Fix losing wallpaper selection when clicking "Apply".

[Eike Hein]

hein created this revision.
Restricted Application added a project: Plasma.

REVISION SUMMARY
  Currently the selected wallpaper is deselected when the "Apply"
  button is clicked, as if no wallpaper is selected. This patch
  fixes that. I didn't understand what the original restoreIndex
  thing was trying to do by passing the count, so I gutted it and
  wrote code that makes more sense to me.

REPOSITORY
  R120 Plasma Workspace

BRANCH
  Plasma/5.9

REVISION DETAIL
  https://phabricator.kde.org/D5440

AFFECTED FILES
  wallpapers/image/imagepackage/contents/ui/config.qml

To: hein, #plasma, mart
Cc: plasma-devel, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol
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