Lockscreen to gone while shade expanded was briefly displaying keyguard

We should hide the keyguard while the the transition to lockscreen to
gone is happening.

Fixes: 327626776
Test: manual -- pull down shade - authenticate with sfps
Flag: ACONFIG com.android.systemui.keyguard_bottom_area_refactor TEAMFOOD
Change-Id: Ic79f544956346b74953b96decd66365f951fbbbf