Fix falsing on notification dismissal.

We were incorrectly analyzing shade swipes during notification
dismissal. When an owner swipes side-to-side, we shouldn't try
to classify it as a shade_drag, which is intended for vertical
drags.

I also found an bad switch-case fall-through in TypeClassifier
related to the BRIGHTNESS_SLIDER that is fixed.

Test: manually swiped on notifications.
Bug: 236197248
Change-Id: Ib040530775a42cb21326f4a74e693565707c1b6f