Fix permit with install code.

[Adminiuga]

permit_with_key() produces

debug: MulticastTableEntry[15] = <EmberMulticastTableEntry multicastId=0x0000 endpoint=0 networkIndex=0>
debug: Send command addTransientLinkKey: (91:e3:5d:0b:00:6f:0d:00, [187, 253, 160, 137, 172, 42, 120, 128, 28, 247, 252, 189, 166, 83, 57, 116])
'EmberKeyData' object has no attribute 'contents'
^CError in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/usr/lib/python3.7/concurrent/futures/thread.py", line 40, in _python_exit
    t.join()
  File "/usr/lib/python3.7/threading.py", line 1032, in join
    self._wait_for_tstate_lock()
  File "/usr/lib/python3.7/threading.py", line 1048, in _wait_for_tstate_lock
    elif lock.acquire(block, timeout):
KeyboardInterrupt

This PR fixes parameter sent to addTransientLinkKey() command.