[sb] Don't show notifs in view model if any chip is showing

This is the current behavior previous to status_bar_root_modernization,
so we should preserve it here

Bug: 364360986
Test: HomeStatusBarViewModelImplTest
Flag: com.android.systemui.status_bar_notification_chips
Change-Id: I98093976a19789d8809fc1ace8bda788d93145e8