D9433: [GTK 3 Preview] Don't explicitly set black background

[Aleix Pol Gonzalez]

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

REPOSITORY
  R99 KDE Gtk Configuration Tool

REVISION DETAIL
  https://phabricator.kde.org/D9433

To: broulik, #plasma, apol
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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