QGenericUnixThemesDBusListener: Remove stray qDebug()

Remove a stray qDebug() statement, that was forgotten in the source.

Pick-to: 6.6 6.5
Change-Id: I5c413b4356f05570474fa2a0d6ad661785c818b0
Reviewed-by: Liang Qi <liang.qi@qt.io>

src/gui/platform/unix/qgenericunixthemes.cpp

@@ -276,7 +276,6 @@ void QGenericUnixThemeDBusListener::loadJson(const QString &fileName)
     QJsonParseError error;
     QJsonDocument doc = QJsonDocument::fromJson(file.readAll(), &error);
     CHECK((error.error == QJsonParseError::NoError), error.errorString());
-    qDebug() << doc;
     CHECK(doc.isObject(), "Parse Error: Expected root object" << s_root);
 
     const QJsonObject &root = doc.object();