Automatically run the mixer thread.

Making this not automatic caused usability issues.  I'm defaulting it to
run again.

Author: HexDecimal

tcod/sdl/audio.py

@@ -267,6 +267,7 @@ def __init__(self, device: AudioDevice):
         super().__init__(daemon=True)
         self.device = device
         self._lock = threading.RLock()
+        self.start()
 
     def run(self) -> None:
         buffer = np.full(
@@ -286,8 +287,8 @@ def on_stream(self, stream: NDArray[Any]) -> None:
 
 class BasicMixer(Mixer):
     def __init__(self, device: AudioDevice):
-        super().__init__(device)
         self.channels: Dict[Hashable, Channel] = {}
+        super().__init__(device)
 
     def get_channel(self, key: Hashable) -> Channel:
         with self._lock: