D4780: [kcheckpass] Drop the conv_legacy support

[Aleix Pol Gonzalez]

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

BRANCH
  drop-conv-legacy

REVISION DETAIL
  https://phabricator.kde.org/D4780

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