Fixes T5140. When you ajax-edit a task and we send back a full-size card, we currently always put a drag grip on it.

If you clicked the "edit" thing from a priority-ordered list, this is appropriate. However, if you clicked it from some other type of list, it is not.

Pass the expected grippableness through the call.

• Edited a task from a reorderable (priority-ordered) view, got grip.
• Edited a task from a nonreorderable (author-ordered) view, got no grip.