event.clientX and event.clientY moved to originalEvent in JQuery 1.9

[upmauro]

For work with JQuery >= 1.9 is necessary change event.clientX and event.clientY to event.originalEvent.clientX and event.originalEvent.clientY

(https://jquery.com/upgrade-guide/1.9/#removed-properties-of-the-event-object)

I will try send PR later.

Thanks for your project.

[upmauro]

https://github.com/ONE-LOGIC/ngFlowchart/pull/42