fix: allow "role=alertdialog" to be closed on escape

This assumption was based on the description of https://github.com/edenspiekermann/a11y-dialog#usage-as-a-modal.

But reading the spec, I don't find a reference to prevent alertdialog dismiss with the `Esc` key. Actually the aria example is dismissable by escape key

https://www.w3.org/TR/wai-aria-practices-1.1/examples/dialog-modal/alertdialog.html

That being said, the backdrop click is still prevented with the role "alertdialog" because the spec also says that "keyboard and mouse interactions only operate within the dialog." and currently our backdrop is outside the dialgoRoot element (although) it's not invalid to move it inside (never tested it) - so this requires further thought

Author: renatodeleao

src/A11yVueDialogRenderless.vue

@@ -40,7 +40,7 @@ export default {
     },
     /**
      * @desc accessibilty attribute: possible usage as modal. If "alertdialog"
-     * will not close on "Escape" key or backdrop click.
+     * will not close on backdrop click.
      * @see https://github.com/edenspiekermann/a11y-dialog#usage-as-a-modal
      */
     role: {
@@ -128,7 +128,7 @@ export default {
       
       const { key, target } = e;
 
-      if (key === 'Escape' && this.role !== 'alertdialog') {
+      if (key === 'Escape') {
         // do not interfere with native input behaviour
         if (target.type === 'search' && target.value !== '') return