Slim recents: use multiwindow button to drag cards

Having two conflicting longclick actions (card guts/favorite and card drag)
doesn't always work perfect. Since we have a multiwindow button in the longpress
menu either way, we can use this one as drag handle.

This reverts commit 9dd1187204c7ed5cecca3bf4a583bdf71d7d3af1

Change-Id: I530802a77aea9611f414efaa94eb8d621341cccf