Fixes opening activities from notifications over lockscreen.

This change modifies StatusBar.onNotificationClicked() such that it no
longer causes the bouncer to be shown if the activity being launched has
showWhenLocked or showOnLockScreen/showToAllUsers set.

Test: manual
Change-Id: I117affbae3eda0ca5a97d3b58c2289dab6f5aa29
Fixes: 113223152