D17351: make use of the new currentIndex api of QML kcms

[Marco Martin]

mart added a reviewer: jgrulich.

REPOSITORY
  R295 KCMUtils

REVISION DETAIL
  https://phabricator.kde.org/D17351

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