D11484: Fix combobox breakage

[Nathaniel Graham]

ngraham added a reviewer: mvourlakos.

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D11484

To: ngraham, broulik, #plasma, mvourlakos
Cc: #frameworks, michaelh, ngraham