Preserve enqueue time of replaced broadcast records.

When a broadcast is sent with FLAG_RECEIVER_REPLACE_PENDING,
we perform in-place swap with older broadcasts but we don't
update the enqueue times and this could result in other
processes getting prioritized even though they have broadcasts
that have been enqueued at a later time.

Bug: 263803500
Test: atest services/tests/mockingservicestests/src/com/android/server/am/BroadcastQueueTest.java
Test: atest services/tests/mockingservicestests/src/com/android/server/am/BroadcastQueueModernImplTest.java
Change-Id: Ie4524a6b05d66be0725650be888f45d2903e1daa