Hide non-system overlay window on ActivityPicker
To improve security.
Bug: 181962311
Test: manual
Show an AlertDialog and observe if it will hide after below command.
adb shell am start -a android.intent.action.PICK_ACTIVITY -n com.android.settings/.ActivityPicker
Change-Id: I6e2845cc19dc012cba2933318a067bbb8db90a23
Merged-In: I6e2845cc19dc012cba2933318a067bbb8db90a23
(cherry picked from commit 3b4853e1)
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