Log calls which were rejected in call log appropriately.

The case for DisconnectCause.REJECTED was not being handled in the call
logging code.  This is important when logging calls locally disconnected
(multiendpoint), and also for calls rejected locally.

Dialer already shows these appropriately in the call log as
"declined call".

Test: All Telecom unit tests run with the "lite_test_telecom" command
Bug: 30474601
Bug: 28813047
Change-Id: Ieb68eed5806658ee975d90c7388e454ae86a0431