D25636: Fixup deprecated use of QWeakPointer::data

[David Edmundson]

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REVISION SUMMARY
  At the point init is run we can be sure that our decoration->client()
  pointer is valid, but we still need to get a strongRef for the duration
  of our usage for Qt6

TEST PLAN
  Compiles

REPOSITORY
  R129 Window Decoration Library

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D25636

AFFECTED FILES
  src/decorationbutton.cpp

To: davidedmundson, #plasma
Cc: plasma-devel, LeGast00n, The-Feren-OS-Dev, jraleigh, fbampaloukas, GB_2, ragreen, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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