LP1950514: TPac hold groups table displays incorrect column names on small screens.

LP1950514: TPac hold groups table displays incorrect column names on small screens.

This fixes the incorrect display of column names in the hold groups table
in the tpac. Previously the table would display names for the hold history
table.

To test:
1. create an opac visible hold group and assign a patron to the group.
2. login to the TPac as the patron assigned to the group.
3. view hold groups and make the browser screen as small as possible.
4. notice on the smallest screen the headers for the table are incorrect.
5. apply the patch and view the headers.

Signed-off-by: Garry Collum <gcollum@gmail.com>
Signed-off-by: John Amundson <jamundson@cwmars.org>
Signed-off-by: Galen Charlton <gmc@equinoxOLI.org>