D9818: [Wallpaper Image Configuration] Set cfg_Image whenever delegate becomes current

[Kai Uwe Broulik]

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REVISION SUMMARY
  The delete button changes the currentIndex to something else when deleting the current image but that didn't update cfg_Image. Just listen to when we become current. Might also fix keyboard navigation (didn't test if that worked before but it certainly does now).
  
  BUG: 388805

TEST PLAN
  Clicked another image, it got selected, Apply applied it.
  Clicked an image, deleted it, another image got selected, Apply was enabled and applied it.
  Verified that the Apply button is disabled when opening the dialog

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D9818

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

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