Bluetooth: Fix initializing response id after clearing struct

Looks like this was missed when patching the source to clear the structures
throughout, causing this one instance to clear the struct after the response
id is assigned.

Fixes: eddb7732

 ("Bluetooth: A2MP: Fix not initializing all members")
Signed-off-by: Christopher William Snowhill <chris@kode54.net>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>