Use data-attributes to define close triggers

Is this something that should instead be solved in the library upstream?

I don't know, the close triggers where defined in the module js before ... its 4 lines of code (while the JS is reduced 1/3 by this change).
So creating a issue in the library, waiting for implementation ..... meh.

Done! Already tested, please review (:

https://git.drupalcode.org/issue/ouibounce_exit_modal-3385648/-/commit/7...

Please do not forget to open a MR from the issue fork and set the status to "Needs Review".

Done! Review again pls.