D28334: [workspace] Use qDeleteAll

[Kai Uwe Broulik]

broulik created this revision.
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REVISION SUMMARY
  Rather than a `foreach` with questionable indentation

TEST PLAN
  Compiles. Doesn't crash on teardown.

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D28334

AFFECTED FILES
  workspace.cpp

To: broulik, #kwin
Cc: kwin, Orage, cacarry, LeGast00n, The-Feren-OS-Dev, cblack, jraleigh, zachus, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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