D29249: Use deprecated QProcess::start() overload

[Vlad Zahorodnii]

zzag created this revision.
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REVISION SUMMARY
  In order to use QProcess::setProgram() we need to split the command into
  a list of tokens. Unfortunately, the relevant method had been introduced
  only in Qt 5.15.
  
  In order to avoid regressions, this change partially reverts cca0e15b45 <https://phabricator.kde.org/R108:cca0e15b455ba606043c720479490794d8d86309>.

TEST PLAN
  `dbus-run-session kwin_wayland "kate foo.txt"` works again.

REPOSITORY
  R108 KWin

BRANCH
  showfps-correct-timestamp

REVISION DETAIL
  https://phabricator.kde.org/D29249

AFFECTED FILES
  main_wayland.cpp

To: zzag, #kwin
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