Only show dialog if top app is killed

This changes the check from only looking at the
app's curSchedGroup to checking if the app that is
killed matches the current top app (retrieved
using resumedAppLocked)

Bug: 67513077
Bug: 67416130
Test: manual
Change-Id: Idda4c4b21081737ee3ab2101a8cf2a94f0d8df23
1 file changed