Prevent KeyguardPresentation been dismissed.

By default Presentation can be dismiss if DisplayMetrics has changed.
However, even when DisplayMetrics has changed, we should still show
KeyguardPresentation on secondary display.

Bug: 149004025
Test: follow issue description.
Test: atest MultiDisplayKeyguardTests
Change-Id: Icf7f5726648bc8b8037bbdd31eac3f0b1cbd5945