Bug of `ToastIt` when its shown from a `<dialog>`

[mobilepadawan]

ToastIt JS is located in the background of the screen when its fired from a HTML <dialog> that is using ::backdrop property.

We need to fix this bug and make a som tests to confirm the solution.

It will coming to solved in the next version of ToastIt.

[mobilepadawan]

This issue is duplicated in another POST #9