Add "sink" event type

addon.xml

 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
 <addon id="script.spotify.screensaver"
     name="Spotify Screensaver"
-    version="0.0.8"
+    version="0.0.9"
     provider-name="Benoît Harrault">
     <requires>
         <import addon="xbmc.python" version="2.25.0"/>

gui.py

@@ -122,7 +122,11 @@ class GUI(xbmcgui.WindowXMLDialog):
             self.next = True
         elif event_type == 'preloading':
             self._preload_images(event_value)
-        elif event_type == 'paused' or event_type == 'stopped':
+        elif (
+            event_type == 'paused'
+            or event_type == 'stopped'
+            or event_type == 'sink'
+        ):
             self._remove_images()
             self.next = True
         else: