D9434: Fix temp GTK3 settings path

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, apol.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  There was a slash missing resulting in it saving to `/tmp.config` and then it failed to look it up

TEST PLAN
  My GTK3 preview now shows the correct theme selected in the KCM

REPOSITORY
  R99 KDE Gtk Configuration Tool

REVISION DETAIL
  https://phabricator.kde.org/D9434

AFFECTED FILES
  src/gtkconfigkcmodule.cpp

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