D15957: [plugins/qpa] Don't crash on Qt5.12 OpengGL::makeCurrent

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REVISION SUMMARY
  QOpenGLContext was changed to call platform->makeCurrent before it
  called setCurrentContext.
  
  Because we bind window FBO and ultimately that calls
  QOpenGlContext::format we need Qt to know which context is current so it
  can tell us the format.
  
  This matches the QtWayland EGL code.
  
  BUG: 399392

TEST PLAN
  Switched virtual desktop with the OSD (previously reliably crashed)
  Now it doesn't

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D15957

AFFECTED FILES
  plugins/qpa/sharingplatformcontext.cpp

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