D9237: port wallpaper config fialog to Package::fileUrl

[Marco Martin]

mart created this revision.
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REVISION SUMMARY
  in the wallpaper config dialog
  there was custom code duplicating listing of kpackage, just wrong
  (if the same wallpaper was installed in more than one place, the
  config file qml was taken from the one with least priority)

TEST PLAN
  wallpaper dialog works again with qresource based packages
  also they load the proper config ui qml file when more than one
  instance of plasmashell is installed

REPOSITORY
  R120 Plasma Workspace

BRANCH
  phab/fileurlwallpaper

REVISION DETAIL
  https://phabricator.kde.org/D9237

AFFECTED FILES
  shell/containmentconfigview.cpp

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