Fix issue where call timeout is triggered for canceled calls.

If you disconnect a call quickly before it's created, the timeout never
gets cleaned up.

Flag: com.android.server.telecom.flags.dont_timeout_destroyed_calls
Fixes: 381684580
Test: Manually reproduced and verified this prevents the anomaly.
Change-Id: I658d66436e8290db06e18fe27ea46ec3035d56a2