Correct the "mouseenter" event mapping to "pointerEnter" event.

Correct what appears to be a copy/paste error that had "mouseenter" mapping to "pointerOut".

If I want to do something when the mouse pointer first touches the node, I need to have a pointerEnter event.  Based on the commented out code above my change, it looks like it used to be correct, but a copy/paste error from the event above it was accidentally pasted instead.

@scottnc27603 @eric79