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

[Nathaniel Graham]

ngraham created this revision.
ngraham added a reviewer: Frameworks.

REVISION SUMMARY
  Use KIO::PreviewJob::defaultPlugins() instead of hardcoding plugin list.
  
  Depends on https://phabricator.kde.org/D8347

TEST PLAN
  Compiles fine in KDE Neon.

REPOSITORY
  R320 KIO Extras

BRANCH
  master

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

AFFECTED FILES
  thumbnail/thumbnail.cpp

To: ngraham, #frameworks
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