Fix blocking task switch when 3P launcher is used.

Bug: 232984498
Test: manual
 1. install 3P launcher and set it as default.
 2. swipe up to start task switcher.
 3. tap a task screenshot to start an activity.
 4. verifity animation starts immediately.
Change-Id: I547c8aae25f6d1701758a72ca95bb9186dd1479f