D26948: [KColorSchemeManager] Don't list duplicates

[David Redondo]

davidre added a reviewer: Frameworks.

REPOSITORY
  R265 KConfigWidgets

REVISION DETAIL
  https://phabricator.kde.org/D26948

To: davidre, #frameworks
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns