CameraJNI: Fix memory leak in stop recording.

Issue:
Due to race conditions, if a recording frame callback is received
after a proxy listener is set to NULL, the callback is forwarded
to JNIContext which does nothing. This will lead to buffer leak
in metadata mode because fd would have been duped already.

Fix:
Release recording frame from JNIContext.

Bug: 30299751
CRs-Fixed: 1040448
Change-Id: I315ec3124014c6309d68fdc1be1e18091a84e154
Bug : 30143478