D20800: Initialise XdgOutput properties on creation

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REVISION SUMMARY
  initWaylandOutput can be called before or after all properites are set.
  If it's called after, we need to still have xdgOuput set correctly.

TEST PLAN
  Simplified Aleix's patch that avoids a no-op setScale call
  Now it works.

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D20800

AFFECTED FILES
  abstract_output.cpp

To: davidedmundson, #kwin
Cc: kwin, jraleigh, GB_2, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, ngraham, alexeymin, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart