On display disconnect, check for global focused task in desk.

Fixes an issue where all desks on a disconnected display would be moved
to top and activated if any of them had the globally focused task. The
toTop check only checks tasks in the desk that is currently being
reparented.

Bug: 391652399
Test: Manual, disconnect display with multiple desks
Flag: com.android.window.flags.enable_display_disconnect_interaction
Change-Id: I2a1916e679a0f3aa58b02e0035f49019c135f497