fix #113208

The deadlock occurs when switching cameras due to a lock ordering issue between the main thread and the camera callback thread:

Scenario:

1. Main thread calls deactivate_feed() to switch cameras
2. ACameraCaptureSession_stopRepeating() is called, which may wait for pending callbacks to complete
3. Meanwhile, onImage callback is running on the camera thread and holds callback_mutex
4. stopRepeating() internally waits for the callback to finish
5. Main thread then tries to acquire callback_mutex → Deadlock

Root cause: The original code called AImageReader_setImageListener(reader, nullptr) after stopRepeating, allowing callbacks to continue firing while the session was being stopped.

Fix

Reorder the cleanup sequence in deactivate_feed():

Why this works:

• Removing the image listener first ensures no new onImage callbacks are dispatched
• stopRepeating and close can safely wait for any in-flight callbacks to complete
• By the time we acquire callback_mutex, no callbacks are running or pending