Bug 34209: Follow up on Bug 28726 - move whole 'select all ...' header into condition

Bug 34209: Follow up on Bug 28726 - move whole 'select all ...' header into condition

Move the whole search header div into the checkbox column condition, so
that other patron search popups don't have an empty div.

To test:
* Activate the ERM module
* Create a new agreement
* Search for a user using the pop-up search
* Verify there is an empty div showing as grey box above the table
* Go to tools > label creator > new batch
* Search for patrons
* Verify the box isn't empty and shows the select all ... options
* Apply patch
* Repeat steps, verify the empty div is gone and the options remain

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>