D25217: don't delete and recreate wallpaperinterface if not needed

[Marco Martin]

mart created this revision.
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REVISION SUMMARY
  the wallpaperinterface instance already reacts to wallpaper package
  change and loads the current one.
  containemtninterface deleted it every time the wallpaper changed
  and recreated, effectively loading the wallpaper two times every time
  the plugin was changed

TEST PLAN
  switching plugins still works, but it's actually visible faster on slow hardware

REPOSITORY
  R242 Plasma Framework (Library)

BRANCH
  phab/dontdelete

REVISION DETAIL
  https://phabricator.kde.org/D25217

AFFECTED FILES
  src/scriptengines/qml/plasmoid/containmentinterface.cpp

To: mart, #plasma
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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