D9176: use the new Package::fileUrl to load from resources

[Marco Martin]

mart added a reviewer: Plasma.

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D9176

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