D9467: Properly check for Breeze GTK 3 theme existence in kconf_update

[Fabian Vogt]

fvogt created this revision.
fvogt added reviewers: Plasma, jackg.
Restricted Application added a project: Plasma.

REVISION SUMMARY
  The gtk-3.0 directory is not mandatory and is gone.

TEST PLAN
  Ran kconf_update_bin/gtkbreeze5.5, settings.ini with Breeze as theme gets created again.

REPOSITORY
  R98 Breeze for Gtk

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D9467

AFFECTED FILES
  kconf_update/main.cpp

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