When v2 flag disabled, hide status bar for Gone->Hub transition

The status bar is shown after exiting edit state. Fix is for Gone->Hub
transition, explicitly hide the keyguard status bar if the v2 flag is
not enabled.

Fixes: 427881009
Flag: com.android.systemui.glanceable_hub_v2
Test: atest KeyguardStatusBarViewControllerTest
Test: verify keyguard status bar not visible when returning to hub
from edit mode

Change-Id: Ief4048766a3047d50404383472798fb879b83309