Do not delay the event if the focused input target is the same

The a11y service requests window focus every time while performing
an a11y action, which also notifies a pointer outside event. Since the
a11y action is to start an activity and the pointer outside event
that was postponed, the caller app task was unexpectedly be brought
to front after the activity launch.

Bug: 356080250
Test: enable talkback and follow the steps on the bug
Flag: EXEMPT bugfix
Change-Id: Ibdb6e8e977540aab1df5e61f33a1bdc28c82d9c0