LP#1614807: Fix Circ History table header display on small screens

LP#1614807: Fix Circ History table header display on small screens

Because the table in circs.tt2 and circ_history.tt2 shared the same CSS class,
circ_history.tt2 was displaying circs.tt2's column headers on mobile devices
and other small screens. The two tables now have distinct classes, and
styles.css.tt2 has been updated to provide the correct table headers for the
circ history page.

Test plan
Pre-patch, pull up a user account that has a circ history in My Account, go to
the Check Out History tab, then resize the screen to a width of 600 pixels or
smaller. The table headers will now display along the side, but the headers
will be the ones that typically display in the Items Out screen. The Barcode
will display in the Date Returned row and the Call number will display in the
Barcode row.

Post-patch, after resizing the screen, the headers that display along the side
should match the ones from the Checkout History interface. All data should
display in its appropriate row.

Signed-off-by: Kathy Lussier <klussier@masslnc.org>