wxQt: translate QPainter of wxClientDC into window client area.

Because Qt considers the menubar and toolbar parts of the client area
and we need to apply the same fix done for wxPaintDC in this commit
9652958 (translate QPainter into window client area.) to wxClientDC too.

Closes wxWidgets#24921.

src/qt/dcclient.cpp

@@ -115,6 +115,8 @@ wxClientDCImpl::wxClientDCImpl( wxDC *owner, wxWindow *win )
 {
      if ( m_ok )
      {
+        m_qtPainter->translate( wxQtConvertPoint(win->GetClientAreaOrigin()) );
+
         m_qtPainter->setClipRect( wxQtConvertRect(win->GetClientRect()),
                                   m_clipping ? Qt::IntersectClip : Qt::ReplaceClip );
     }