D10038: Use QTemporaryDir::filePath() instead of path concatenation

[Eike Hein]

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

REPOSITORY
  R119 Plasma Desktop

BRANCH
  Plasma/5.12

REVISION DETAIL
  https://phabricator.kde.org/D10038

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