D23904: Add QIcon setters for the password dialogs

[Volker Krause]

vkrause added a task: T11637: Investigate if KIconThemes is needed as a framework.

REPOSITORY
  R236 KWidgetsAddons

REVISION DETAIL
  https://phabricator.kde.org/D23904

To: vkrause, dfaure
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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