Apply display density to topology pane scaling

Account for high DPI screens in topology pane scaling.

Flag: com.android.settings.flags.display_topology_pane_in_display_list
Bug: b/352650922
Test: atest DisplayTopologyPreferenceTest.kt
Test: atest TopologyScaleTest.kt
Test: compare appearance on mid-dpi and high-dpi screens with a single 1080p external display
Change-Id: I192fccd402c20e00beacdb5ad55eed406252eb93