Fix edge case where LauncherOverlay scroll woudln't be reset

-> If the Workspace has a single page and the user goes from overscrolling
   in one direction, and then the other, the LauncherOverlay scroll wouldn't
   be set to 0 until the scrolling settled

Change-Id: I29ee9abdfa023ae3599d1590cdaebf457e2220fa
1 file changed