D8399: Fix colours not updating in systemsettings

[Marco Martin]

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

REPOSITORY
  R124 System Settings

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D8399

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