fix start restart bugs

src/auracast/multicast.py

@@ -336,10 +336,7 @@ class Streamer():
         self.is_streaming = False
         if self.task is not None:
             self.task.cancel()
-            try:
-                await self.task
-            except asyncio.CancelledError:
-                pass
+
             self.task = None
 
         # Close audio inputs (await to ensure ALSA devices are released)