remove all logos on configure()

modes/Tunnel.cc

@@ -146,6 +146,7 @@ bool Tunnel::configure (GnomeScreensaver & gs)
 
     glViewport(0, 0, gs.getWidth(), gs.getHeight());
 
+    m_logos.clear();
     for (int i = 0; i <= N_INITIAL_LAYERS; i++)
     {
         addRing((i - N_INITIAL_LAYERS) * RING_LAYER_DIST);