First pass on fixing the delete button from disappearing.

Fixed issue: https://joindin.jira.com/browse/JOINDIN-434

*Test:*
1. As an event admin, go to the event tracks editing screen.
2. Notice each track has a delete and edit button.
3. Press 'edit'
4. Press 'cancel'
5. The delete button should still be there
6. Click the 'delete' button to verify that the track gets deleted.