D9792: even slimmer scrollbars

[Marco Martin]

mart added a reviewer: hpereiradacosta.

REPOSITORY
  R31 Breeze

REVISION DETAIL
  https://phabricator.kde.org/D9792

To: mart, #plasma, #kirigami, #vdg, hpereiradacosta
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, davidedmundson, mart, hein
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