Fixed a bug where we weren't releasing views

When tracking with the headsuptouchhelper, views
would not be released properly, since we're handing
over the touch to the panel.
This is now fixed.

Test: drag down on heads-up, observe normal motion
Change-Id: Ia9eef07c789d6d03098c2e34f86c16fdeeb93d42
Fixes: 37314754