Bug 21030: Date widget on suspend modal not working correctly

Bug 21030: Date widget on suspend modal not working correctly

This patch makes a change to the suspend hold modal markup in order to
allow the datepicker <selects> to work properly.

To test, apply the patch and locate a patron in the staff client who has
holds.

 - On the checkout or patron detail page, open the holds tab.
 - Click the "Suspend" button for one of the holds.
 - In the modal, trigger the date picker and confirm that the dropdowns
   for selecting month and year work correctly.

Signed-off-by: Pierre-Marc Thibault <pierre-marc.thibault@inLibro.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>