Play over-keyguard transitions in default handler

If we're not showing the keyguard at all in the transition, we don't
need to inform KeyguardViewMediator about it and can play the normal
inter-app animation.

This restores some behaviour from the original RemoteAnimation code that
set up remote transition filters.

Test: atest ShellTransitionTests
Bug: 282672298
Change-Id: Ib544627a69c7102f41b390475095dfe9ecef45ea