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

[Aleix Pol Gonzalez]

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

REPOSITORY
  R318 Dolphin

BRANCH
  master

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

To: ngraham, #dolphin, elvisangelaccio, dfaure, apol
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