[#2900]

1. Force focus on the default editor when not using the media or share editors.
2. Fixed hidden bug where the media editor was manually switching focus, we had mapped the wrong name in header.js

Lighthouse Ticket: https://webmademovies.lighthouseapp.com/projects/65733/tickets/2900-should-the-events-button-remain-highlighted-when-in-an-track-event-editor