Hide the nav handle when going to AOD rather then having it stay there, change...

Hide the nav handle when going to AOD rather then having it stay there, change color, then disappear.

This has annoyed me for a very long time and is now very easy to fix.

Bug: 278086361
Flag: com.android.systemui.keyguard_wm_state_refactor
Test: go to/from AOD from GONE/LS, ensuring the handle re-appears on LS/GONE
Change-Id: I1d11080fb73f1f21f566ce4c6180e330a93dd767