Fixed an issue where the notification wasn't clickable

An earlier implementation of suppressing the ripple didn't
work properly since it could also suppress the click.
We're now suppressing it by removing the pressed state
from the drawable state.

Test: add notification, draw down on it and tap close to the action button a few times, normal launch observed
Change-Id: Icc0efe16125375eaf18ec0df7236faab1232d512
Fixes: 73106085