D1798: Port some displayWidth/displayHeight usages to Screens::size()

[Martin Flöser]

graesslin added a reviewer: Plasma.
graesslin added a subscriber: plasma-devel.

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D1798

To: graesslin, #kwin, #plasma
Cc: plasma-devel, kwin, ZrenBot, progwolff, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart, lukas
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