Revert^2 "Defer destroy activity if it is in transition."

This reverts commit 145e8fa4.

Reason for revert: Original CL need to consider if the finish activity
is the last activity in the display, there is no close display
transition right now.

Test: atest CarActivityManagerTest
Bug: 343671768
Bug: 318877215
Bug: 323129567
Change-Id: Ia405ec2d8229f2ff7668be5361eb48f9c5793f2e