D8846: Use KConfig::readEntry()'s default argument properly

[Nathaniel Graham]

ngraham created this revision.
ngraham added reviewers: Dolphin, elvisangelaccio, dfaure.

REVISION SUMMARY
  Follow-on patch to https://phabricator.kde.org/D7440 to use KConfig::readEntry()'s default argument properly to reduce some unnecessary code

TEST PLAN
  Tested in KDE Neon. no regressions; by default, all plugins are enabled if the key is not set, and if it is set, user changes to the list are remembered

REPOSITORY
  R318 Dolphin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D8846

AFFECTED FILES
  src/kitemviews/kfileitemmodelrolesupdater.cpp
  src/settings/general/previewssettingspage.cpp
  src/views/dolphinitemlistview.cpp

To: ngraham, #dolphin, elvisangelaccio, dfaure
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