Do not compact animating persistent process

To avoid jank when system ui runs animation for screen off.

Bug: 214654755
Test: Change CompactThrottlePersistent to 100ms
      adb shell device_config put activity_manager_native_boot \
                compact_throttle_6 100
      Turn off screen and event log should not show am_compact
      for com.android.systemui immediately.
Change-Id: Ic245ec5c9217d642f9b6eb73e5a733713fca1275