Issue 7077 - Stop icon animation after notification is clicked

We were calling notificationClosed() instead of exports.notificationClosed(), so we were just clearing activeNotification and not stopping the icon animation.

I also notice that we were calling it from both where we clear the notification, and the close listener. Unnecessary I think, since I figure the former will always trigger the latter. From the chrome.notifications.onClosed docs

The notification closed, either by the system or by user action.

Finally, I got rid of the "If there's an notification, but it isn't a question and it has no links" logic... I couldn't see any point to that, even after searching back through the commit history. I'd be interested to hear what you think to that.