Fix ringer not stopping when call is blacklisted.

We skipped quite a lot of post-call cleanup in the blacklist case,
including stopping the ringer. Because of that, it depended on the
timing of the first ring event and the disconnect event whether ringing
was correctly suppressed or whether the phone rang indefinitely.

Fix that by only skipping the steps that need to be skipped (mainly
adding the call log entry).

Change-Id: Iaa374e67913fed9893d2df88927048589a0c0aab
JIRA:CYAN-2131