aioble/examples/temp_sensor.py: Wait forever for client to disconnect.

This sets the disconnected timeout to None, so that the peripheral waits
forever for the client to disconnect.  Previously the peripheral would
abort the connection after 60 seconds (because that's the default timeout).

Signed-off-by: Stephen More <stephen.more@gmail.com>

micropython/bluetooth/aioble/examples/temp_sensor.py

@@ -56,7 +56,7 @@ async def peripheral_task():
             appearance=_ADV_APPEARANCE_GENERIC_THERMOMETER,
         ) as connection:
             print("Connection from", connection.device)
-            await connection.disconnected()
+            await connection.disconnected(timeout_ms=None)
 
 
 # Run both tasks.