[Pas2js] TJSMouseEvent updated definition

[Michael Van Canneyt]

On Sun, 10 Jun 2018, warleyalex via Pas2js wrote:

> today I've updated TJSMouseEvent definition, I had to include the
> initMouseEvent and getModifierState  methods.
>

InitMouseEvent is deprecated, you must use the constructor.
https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/initMouseEvent

But I have added getModifierState()

Michael.