Load chat background from embedded resources

tools/chatgui/src/messagelist.cpp

@@ -558,7 +558,7 @@ MessageList::MessageList(DbManager* db, AudioRecorder* recorder, QWidget *parent
     m_view->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
     m_view->setVerticalScrollMode(QAbstractItemView::ScrollPerPixel);
     m_view->setFrameShape(QFrame::NoFrame);
-    m_view->setBackgroundImage("../resources/bg.png");
+    m_view->setBackgroundImage(QStringLiteral(":/bg.png"));
     layout->addWidget(m_view, 1);
 
     if (s_icons.empty()) {