live/runner: Increase liveportrait restart threshold (#294)

It's not giving enough time for the pipeline to load and gets
to an infinite loop.

runner/app/live/streamer/streamer.py

@@ -118,7 +118,7 @@ async def monitor_loop(self, done: Event):
 
             active_after_reload = time_since_last_output < (time_since_reload - 1)
             stopped_recently = (
-                time_since_last_output > 5
+                time_since_last_output > 8
                 if self.pipeline == "liveportrait" # liveportrait loads very quick but gets stuck too often
                 else active_after_reload and time_since_last_output > 5 and time_since_last_output < 60
             )