Fix launcher-in-transition-targets detection

Shell transitions promotes animation up to root task so
we can't compare to leaf-taskid derived from ActivityRecord.getTaskId
since home tasks are all children of a root and thus aren't
organized.

This replaces the task-id check with a componentname check.

Bug: 172695387
Test: with shell transit enabled, launch an app from launcher
      and observer launcher content animating.
Change-Id: Ieeca72b57ec47c9cbe15e635f5026b53edebd0ad