Fix activities cannot be resumed when non-secure keyguard shown

Activities were unable to show on secondary displays with
FLAG_CAN_SHOW_WITH_INSECURE_KEYGUARD flag because the AOD
was showing on default display.

Bug: 128248976
Test: atest KeyguardTests
Test: atest ActivityManagerMultiDisplayTests

Change-Id: Ifcbc06106c306aca897d280f84d19fb7fb8a6582