D16096: [qpa] Always keep a at least one screen

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REVISION SUMMARY
  Qt does not like having no screens. Both Qt XCB and Wayland QPAs have
  systems pretend there's always at least 1 screen
  present.
  
  Kwin already uses a dummy screen on startup, this patch reinserts the
  dummy screen if the platform states that all real screens are removed.
  
  BUG: 399564

TEST PLAN
  Logged in, everything still worked
  Did not reproduce the original bug

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D16096

AFFECTED FILES
  plugins/qpa/integration.cpp

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