Remove logic for disable all displays in StatusBarManagerService.

This causes a bug on changing users on Car Sysui - b/409327478

This will be re-added after finding and fixing the root cause

Bug:409327478
Flag: com.android.systemui.shared.status_bar_connected_displays
Test: atest com.android.server.statusbar.StatusBarManagerServiceTest
Change-Id: Iabf900a04fcaa95d11a5c1634c4a08e1bf61bfce