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

[David Edmundson]

davidedmundson accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R242 Plasma Framework (Library)

BRANCH
  phab/dontdelete

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

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