Don't skip dispatching onUidGone() when a uid dies.

Earlier, onUidGone() could have been skipped if the uid
is restarted immediately after it died.

Bug: 171049615
Test: atest ./tests/app/src/android/app/cts/ActivityManagerProcessStateTest.java
Test: atest ./tests/app/src/android/app/cts/BadProviderTest.java
Test: atest services/tests/servicestests/src/com/android/server/am/ActivityManagerServiceTest.java
Test: atest services/tests/servicestests/src/com/android/server/am/UidObserverControllerTest.java
Change-Id: Ic2cc58b0967f95e7414d610107400ad32351cc16