D20080: Fix typo of dolphinsettingsdialog.cpp

[Yi-Jyun Pan]

ppeter added a reviewer: Dolphin.

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D20080

To: ppeter, #dolphin
Cc: kfm-devel, alexde, feverfew, meven, spoorun, navarromorales, firef, andrebarros, emmanuelp, mikesomov
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