Fix the flaky sched group with the BIND_SCHEDULE_LIKE_TOP_APP

If the current sched group is already TOP, we'll actually ignore
the BIND_SCHEDULE_LIKE_TOP_APP, which moves the sched group to
restricted if the screen is OFF.

Bug: 298747034
Test: atest MockingOomAdjusterTests
Change-Id: I206e0308a4e43f65e537c1f247ba3ce8f036b6d2
Merged-In: I206e0308a4e43f65e537c1f247ba3ce8f036b6d2
(cherry picked from commit 272addb1)