Prevent privacy dot from hiding if shade is expanded in another display

Each display has a privacy dot (when needed). before this change, a shade expansion was hiding them on all displays.

After this change, the expansion hides them only in the display the shade is at.

Bug: 362719719
Bug: 403608290
Test: PrivacyDotViewControllerTest
Flag: com.android.systemui.shared.status_bar_connected_displays
Flag: com.android.systemui.shade_window_goes_around
Change-Id: I0e517673a02aa5a006ac1409f5d4b347501c63e8