Bug 22477: Missing DataTables configuration when searching patrons for holds

Bug 22477: Missing DataTables configuration when searching patrons for holds

This patch adds columns configuration to the holds request page to fix a
JavaScript error in the console and to allow the patron search results
table to be enabled as a DataTable.

To reproduce: Place a hold on a title in the staff client. When prompted
for a patron, perform a search which will return multiple results. The
patron search results will appear in an unsortable table. A JS error can
be seen in the browser console.

To test, apply the patch and repeat the steps above. The patron search
results table should be sortable and there should be no JS error.

Signed-off-by: Pierre-Marc Thibault <pierre-marc.thibault@inLibro.com>
Signed-off-by: Bin Wen <bin.wen@inlibro.com>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>