Fix activities are not removed while removing the Display

Activities are re-parented to default display when the display
is removed, even when the remove-content-mode is set to
REMOVE_MODE_DESTROY_CONTENT.

Checking the remove content mode settings in the DisplayWindowSettings
vs. the settings in the DisplayInfo.

Bug: 356220670
Test: atest DisplayWindowSettingsTests
Flag: EXEMPT bugfix
Change-Id: I7754d242cdaa6f0ccf50db0de664ab183a76cbce