After updating zed, a notification is shown in the bottom right with the
new version number, a link to the release notes, and an 'x' to dismiss
the dialog.

Before this PR, clicking the link to the release notes would not dismiss
the modal. So, a user returning to the IDE after viewing the notes in
the browser would still see the notification. With this change, clicking
'View release notes' also dismisses the notification.

Co-authored-by: tomholford <tomholford@users.noreply.github.com>

Release Notes:

- Made update notification to dismiss when viewing releases notes