D20999: IconItem: remove remaining & unused smooth property bits

[Aleix Pol Gonzalez]

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

REPOSITORY
  R242 Plasma Framework (Library)

BRANCH
  removelastsmoothbits

REVISION DETAIL
  https://phabricator.kde.org/D20999

To: kossebau, #plasma, davidedmundson, apol
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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