Accordion onmouseup change events guaranteed to not fire

[thezboe]

https://github.com/LGSInnovations/sigplot/blob/5bae7873547e8a490a691ee30c2576800e6cb81a/js/sigplot.accordion.js#L429-L451

this.dragging and this.edge_dragging are set to false just before the if-statement that returns if one of them is false. Furthermore, I believe the if-statement logic is incorrect. this.dragging is set to true if the center is being dragged, and this.edge_dragging is true if the edge is being dragged. They are never both true at the same time it appears, so the if-statement will always be truthy and the event never fired.