Disable double haptic when dragging from taskbar hotseat on home

Both DragLayer and the dragged view were playing a haptic; disable
DragLayer's haptic feedback for this drag interaction.

Test: Drag from hotseat on home, ensure only one haptic is played
Bug: 182079330
Bug: 171917176
Change-Id: I185533999e905ea79a80aaa2145fc39049e8d45e