[Differential] [Updated] D3531: Drop kioslave folder, will be in KIO 5.29

[elvisangelaccio (Elvis Angelaccio)]

elvisangelaccio added a dependency: D3530: Import plasma-workspace kioslaves.

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D3531

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To: elvisangelaccio, #plasma
Cc: plasma-devel, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas