D29463: Fix Kirigami.Units.devicePixelRatio=1.3 when it should be 1.0 at 96dpi

[Chris Holland]

Zren added reviewers: Kirigami, mart.

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D29463

To: Zren, #kirigami, mart
Cc: kde-frameworks-devel, LeGast00n, cblack, michaelh, ngraham, bruns