D25707: [renamedialog] Replace KIconLoader usage with QIcon::fromTheme

[Nicolas Fella]

nicolasfella added a reviewer: dfaure.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D25707

To: nicolasfella, #frameworks, dfaure
Cc: broulik, kde-frameworks-devel, LeGast00n, cblack, GB_2, michaelh, ngraham, 
bruns