[CS] Have ActivityStarterImpl inject display ID directly.

These were the last usages of CentralSurfacesImpl#getDisplayId, so that
method is now removed.

Bug: 277764509
Bug: 277762009
Test: restart sysui while device unfolded > verified via logging that
CentralSurfacesImpl and ActivityStarterImpl have the same display ID.
Test: restart sysui while device folded > verified same
Test: long press on lockscreen > open "Customize lock screen" > verify
customizer opens with animation
Test: long press on QR code scanner lockscreen shortcut > verify QS code
scanner opens with animation
Test: atest ActivityStarterImplTest

Change-Id: Idb054b6bd010c2f2d984db2fd64199534c6c8fbe