Trigger endRelocation on focusable drag end

It isn't usually called, but if it is onDocumentDrop might not fire,
(e.g. dropping back on itself) so call endRelocation here. It doesn't
matter if endRelocation is called twice.

Change-Id: I259fbfb0fe122c1bad7ea49fb7f5684821eca452
Merge "Trigger endRelocation on focusable drag end"