Bug 26983: Fix [un]select all links in inventory

Bug 26983: Fix [un]select all links in inventory

The select/unselect all links took into account only the items displayed
when the page was loaded (so 20).

Test plan:
1. Go to Tools-> Inventory-> Do a Search to produce more than 20 results
2. Select 50, 100 or All entries to show
3. click on Select All
=> All items must be selected, not only the first 20

Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit e15446af125d0986cc3d9f122e91b21a5e21c6f6)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit 1ca4cbf0762e5c47d3efa5a0310cbbfa70add2d2)

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>