Removing translation of shade dependent on finger position

Shade was horizontally translated for bigger screens (when notification width * 1.75 was smaller than screen width) depending on when pull down movement was started. Now this translation is no longer needed.

Fixes: 199879348
Test: manual + NotificationPanelViewControllerTest
Change-Id: I3837170eb1012326a60d3e12eabacb947be0df32