D5008: [ksld] Don't unset greeter connection on destroy unconditionally

[Marco Martin]

mart accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R133 KScreenLocker

BRANCH
  ksld-greeter-destroyed

REVISION DETAIL
  https://phabricator.kde.org/D5008

To: graesslin, #plasma, mart
Cc: plasma-devel, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol
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