[flexiglass] Set CommunalScene to run test correctly

Previously test was failing with the
scene container flag enabled since the communal
state was not appropriately set. Now the scene
is set.

Flag: EXEMPT test only change
Bug: 409851925
Test: atest OccludingAppDeviceEntryInteractorTest
Change-Id: Ic82c686191d5b670d998da6ab751d3e00891fd7c