Bug 35055: Exclude actions column from patron search results DataTables export

Bug 35055: Exclude actions column from patron search results DataTables export

This patch updates the markup of the patron search results table so that
the "actions" column (Edit, Check out) are excluded when using the
DataTables "Export" button. The configuration was already in place but
the column header lacked the required class.

To test, apply the patch and perform a patron search which will return
multiple results.

Click the "Export" control at the top of the patron search results
table and choose "Print." In the print preview there should be no final
column containing "Edit" and "Check out."

Signed-off-by: Barbara Johnson <barbara.johnson@bedfordtx.gov>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>