[SB] Don't show home status bar on lockscreen, even for HUNs.

Previously, we needed to show the home status bar on lockscreen when a
HUN came in so that the HUN's app name would show. But we don't need to
do that when StatusBarNoHunBehavior is enabled.

Fixes: 406419894
Bug: 385740230
Flag: com.android.systemui.status_bar_no_hun_behavior

Test: no_hun_behavior enabled & root_modernization enabled: Have face
unlock with bypass enabled. While on lockscreen *after face unlock
fails*, receive a HUN -> verify home status bar never appears, carrier
text is always shown in the left part of the status bar while the HUN is
shown
Test: no_hun_behavior enabled & root_modernization *disabled* -> verify
same behavior

Test: no_hun_behavior *disabled* & root_modernization disabled: Have
face unlock with bypass enabled. While on lockscreen *after face unlock
fails*, receive a HUN -> verify carrier text in status bar hides and HUN
app name + app icon shows

Test: atest HomeStatusBarViewModelImplTest
Change-Id: Iadff4590ab811085cc3e59a41e24a5d33d6b7424