Fix VirtualDisplayTest failures

The failures are due to legacy behaviors in the test, which includes:
1. Use Toast without managed token
2. Show presentation on the default display

Currently, we need a managed window token for toast, and also the
display to show preentation should be a presentation display.
A built-in display isn't a presentation display by default.

In this CL, we
1. Use the default window type for Presentation
2. Use fullscreen overlay dialog on the default display
to fix this test

Bug: 223843046
Test: atest VirtualDisplayTest

Change-Id: Ifa790a3436ed487f4af79296e47a900d62cea375