D25891: fix preview of plain text files when using dark theme

[Anthony Fieroni]

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

REPOSITORY
  R320 KIO Extras

REVISION DETAIL
  https://phabricator.kde.org/D25891

To: iliakats, #dolphin, anthonyfieroni
Cc: kde-frameworks-devel, kfm-devel, pberestov, iasensio, fprice, LeGast00n, MrPepe, fbampaloukas, alexde, GB_2, Codezela, feverfew, meven, michaelh, spoorun, navarromorales, firef, ngraham, andrebarros, bruns, emmanuelp, mikesomov
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