Fix incorrect onDisplayChanged transmission before onDisplayAdded

Before this CL, to configure LogicalDisplay.mCanHostTasks,
onDisplayChanged() is incorrectly sent before onDisplayAdded().
This CL fixed this issue and ensures DisplayWindowSettings reflects the
value of canHostTasks when onDisplayAdded() is called.

Bug: 396028492
Test: atest DeferredDisplayUpdaterDiffTest
Flag: com.android.server.display.feature.flags.enable_display_content_mode_management
Change-Id: I01b16ffdb8fac031ad79ce406942e6a558bd6134