Do not start drag from pre-drag if cancelled during animation.

This change affects the preDragCondition for icons that do not have a
popup menu. The condition assumes we are still in pre-drag after
DragView is finished animating, but the user can cancel the drag in this
time (e.g. by releasing their finger early).

Test: Manual. Holding and releasing on suspended icon does not crash,
while holding and dragging still works as expected.
Fix: 258233476

Change-Id: Ic76f785cffcbfe0fe51eb1473022f2dc34563070