Hover dialog should be a little farther from the cursor

[staktrace]

Often I find that I accidentally hover over a point I don't mean to and then can't get to the point I do care about because the hover dialog is now hiding it. I'd prefer if the dialog were a little farther away from the mouse cursor so that it doesn't interfere with hovering over the points.

[Nephyrin]

fixed by 506e110