D8352: Use KIO::PreviewJob::defaultPlugins()

[Elvis Angelaccio]

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

REPOSITORY
  R320 KIO Extras

BRANCH
  arcpatch-D8352

REVISION DETAIL
  https://phabricator.kde.org/D8352

To: ngraham, #frameworks, broulik, elvisangelaccio, markg