[stable28] fix: Close button should just exit for the edit local modal

[backportbot]

This is a hotfix to avoid reopening the document if the user clicks the close button. In the old server API to open dialogs we cannot differentiate between close and the cancel action, so we use the global event object to check which one was clicked. On main (29+) this is resolved by using the spawnDialog function where we can pass our own vue component that allows us to handle this properly

Follow up fix to #3524

Steps to reproduce:

• Open a file in Collabora
• Click the button to open locally
• Confirm to open locally in the first modal
• Cancel the browser dialog to open locally
• See the second Nextcloud dialog and press the X button to close

Before: The document reopened

After: Now the dialog is just dismissed