Revert "Make sure TAPL waits for Launcher activity to stop each time it stops"

This reverts commit dd33b64a.

Reason for revert: “DroidMonitor: Potential culprit for Bug b/323619378 - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.”.

Bug:323619378
Change-Id: Iadaa80f2cc51f39ae3ab73cdd49a98d05835506e