D8807: Fix warning regarding blur setting

[David Edmundson]

davidedmundson added reviewers: guoyunhe, ngraham.

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D8807

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