Disconnect telnet when denonavr media player entity is unloaded (#126406)

Disconnect telnet when unloading `denonavr` media player entity

homeassistant/components/denonavr/media_player.py

@@ -301,6 +301,8 @@ class DenonDevice(MediaPlayerEntity):
 
     async def async_will_remove_from_hass(self) -> None:
         """Clean up the entity."""
+        if self._receiver.telnet_connected:
+            await self._receiver.async_telnet_disconnect()
         self._receiver.unregister_callback(ALL_TELNET_EVENTS, self._telnet_callback)
 
     @async_log_errors