Points now delete properly in click-to-add-points

Summary: Deletion was broken when we fixed the points-always-stay-orange-on-tablet bug.
The issue is that the mouse-out and mouse-over events had to be bound to vmouseout and
vmouseout. This doesn't revert the points-always-stay-orange fix because we're only
binding these events when we think we're on a mouse device anyway.

Test Plan: Add and delete some points in the browser and on a tablet.

Auditors: jack