Force system scope for settings to be in $CREATORDIR/share/qtcreator.

Note that according to QSettings design, the file itself then is
in $CREATORDIR/share/qtcreator/Nokia/QtCreator.ini. Note case (Unix)
and Vendor dir!

src/app/main.cpp

@@ -180,6 +180,9 @@ int main(int argc, char **argv)
     QTranslator translator;
     QTranslator qtTranslator;
     QString locale = QLocale::system().name();
+
+    // Must be done before any QSettings class is created
+    QSettings::setPath(QSettings::IniFormat, QSettings::SystemScope, QLatin1String(SHARE_PATH));
     // keep this in sync with the MainWindow ctor in coreplugin/mainwindow.cpp
     const QSettings settings(QSettings::IniFormat, QSettings::UserScope,
                                  QLatin1String("Nokia"), QLatin1String("QtCreator"));