Modal backdrop static does fire event when modal is clicked

[nuke-ellington]

What happened?

Normally the modal should close when the backdrop gets clicked. Currently it seems as the modal closes when itself is clicked as well.

What type of frontend frameware are you seeing the problem on?

Angular

Which version of iX do you use?

1.1.2

Code to produce this issue.

modalService
      .open({
        backdrop: 'static',
        centered: true,
        content: this.modalRef,
        scrollable: true,
        title: 'Customize columns'
      });

[danielleroux]

#285