D7781: Don't set QT_SCREEN_SCALE_FACTORS on wayland

[David Edmundson]

davidedmundson created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  Scale factor is sent on the output, we don't need to have the hacky env
  variables.
  
  When the kscreen KCM is used on wayland it doesn't set the variable this
  is using.

TEST PLAN
  Configured an X session to have high DPI with this variable.
  Logged into a wayland session, ran env.
  
  (font DPI is still a problem, if it gets set on X
   it's visually doubled on my wayland session. )

REPOSITORY
  R120 Plasma Workspace

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D7781

AFFECTED FILES
  startkde/startplasmacompositor.cmake

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