D29340: fix(kcm): avoid recursive OpacityMask which leads to teardown crash

[David Edmundson]

davidedmundson created this revision.
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REVISION SUMMARY
  In the current code OpacityMask's source is the parent which contains
  itself, which doesn't make sense. Docs explicitly say this.
  
  This leads to a crash in teardown.
  
  A quick reshuffle fixes it.
  
  BUG: 419625

TEST PLAN
  Found reproducible steps (see bug)
  No longer crashes

REPOSITORY
  R104 KScreen

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D29340

AFFECTED FILES
  kcm/package/contents/ui/Output.qml

To: davidedmundson
Cc: plasma-devel, Orage, LeGast00n, The-Feren-OS-Dev, cblack, jraleigh, zachus, fbampaloukas, ragreen, ZrenBot, ngraham, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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