[BUG] Modal with alert callback not closing on browser navigation

[x] I have written a good issue

Describe the bug

On web if you open a modal that implements an alert callback (canDismiss) it does not close correctly when using browser back/forward

Describe how to reproduce the bug

Open any modal that implements an alert callback
Navigate using browser back/forward
See that the page changes behind the modal but the modal does not close

Which Kirby version was used?

## What was the expected behavior? The modal should close when changing page/route regardless of the alert callback implementation OR browser navigation is disabled (stopped) when an alert callback is present ## Add any screenshots ## Please complete the following information: - Any browser with access to back/forward navigation ## Are there any additional context?

Checklist:

The following tasks should be carried out in sequence in order to follow the process of contributing correctly.

Verification

To make sure the bug is not intended behaviour; it should be verified by a member of team Kirby before moving on to implementation.

[ ] Make sure the NOT verified label has been removed by a member of team Kirby; do not proceed until this is done.

Implementation

The contributor who wants to implement this issue should:

[ ] Make sure you have read: "Before you get coding".
[ ] Signal to others you are working on the issue by assigning yourself.
[ ] Create a branch from the develop branch following our branch naming convention.
[ ] Create a test that reproduces the bug following guidelines in: "The good: Test".
[ ] Write code to fix the bug

Review

Once the issue has been implemented and is ready for review:

[ ] Do a self-review.
[ ] Create a pull-request.

kirbydesign / designsystem