fix: Fixes Modal using animation frame

[ChristianKienle]

So this is how I would fix the modal.

It is ugly. :D By using an animation frame / setTimeout, we simply delay the registration of event handlers.

There are other ways to do it. One would be to use the same approach using for FdPopover which we already discussed within the context of the FdPopper-component. But this is a minimally invasive fix. I also think that the use case is different:

I think a trigger component and a simple popover usually share the same context. There is usually not a lot of reuse. However I might have a single "Save Modal" which I want to trigger from everywhere. At least this was the reason for doing it differently. But we will see. If you think this change is acceptable simply merge it into your branch.

If not: Let's talk. :D

[suwarnoong]

Looks good. I just learned how the prop.sync works. Awesome