Show case properties in the "Case History" table of the Case Export page by default

Previously, you had to check the "show advanced and deleted properties" box to see all properties in the case history table. Now, all of those properties will be shown regardless of whether the box is checked or not. (The "Cases" table is unaffected).

Addresses this ticket:
http://manage.dimagi.com/default.asp?123010#695770
I think `sync_log_id` might be the only one for now. 3 is just that the base template is shared by both form and case exports, whereas the code that flags certain properties as hide/show is specific to which export you're viewing.