D8939: Offset the scrollbar by the header size

[Aleix Pol Gonzalez]

apol added reviewers: ngraham, abetts.

REPOSITORY
  R169 Kirigami

REVISION DETAIL
  https://phabricator.kde.org/D8939

To: apol, #kirigami, mart, ngraham, abetts
Cc: plasma-devel, apol, davidedmundson, mart, hein
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