Display-aware overview item assertion

This CL fixes CUJ-7p which verifies the overview mode behavior on
projected mode.
In projected mode, CD’s and the internal display’s overviews are
triggered separately. Therefore, in CUJ-7p, we have to trigger the CD’s
overview explicitly by clicking the recents button on CD.
This test _was_ passing before accidentally just because the CD overview
implementation was not completed.

Flag: EXEMPT - test fix
Bug: 425190576
Test: ConnectedDisplayCujSmokeTests#cuj7p
Change-Id: I9f6231e513807fb18ac67007925ead4f0e7f52ae