[CD Taskbar] Set correct window type for TaskbarActivityContext on primary/secondary displays

Modified TaskbarActivityContext to be aware of the display it's on (primary or secondary). This allows it to set the correct layoutParams.windowType for the Taskbar view, using TYPE_NAVIGATION_BAR for the primary display (the standard Taskbar) and TYPE_NAVIGATION_BAR_PANEL for secondary displays.

Bug: 385202874
Test: Manual
Flag: EXEMPT not adding behavior
Change-Id: I5addf45b6099d3ddcf8315a541b69d2f67bace7d