Fix pip surface properties during keyguard exit

Since corner/shadow properties are reset in WMCore by
default, we need to "restore" them when pip tasks remain
in pip. This was already done by updatePipForUnhandledTransition,
but hadn't been hooked-up to keyguard transition.

Also updatePipForUnhandledTransition wasn't applying shadow
changes, so some transitions could "lose" the shadow.

Bug: 282772456
Test: open app in pip, lock, unlock.
Change-Id: I3efab2608a15d569fc19de38aa18c99144ca4070