Don't ignore gestures on pulsing.

When a notifiction hun's/pulses, the screen ist still considered to
be dozing. Before this change we were ignoring all gestuers while
dozing. With this change, we no longer ignore gestures if #isDozing
returns true.

Fixes: 187833497
Test: manual && atest SystemUITests
Change-Id: Ifec028da330e9f6d4be997313bbbd93fd4d466ea