base

Enabled expansion and dragging down when QS is expanded

Previously going to the full shade and expanding notifications
where disabled when QS was expanded even though there was enough
space to allow it. This is now allowed again in order to have
a consistent experience.

Bug: 19712809
Change-Id: Ie756d9c3fbf9dc2e60a05d02f0f4cc5dd6c7ebe0